Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4da9a0fa6ca8a64…

MALICIOUS

PDF

77.7 KB Created: 2021-03-21 06:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c8284b57ed676a8ca1bd4391158c962f SHA-1: cf44090d8c2cc1928a4e70a885a7f9d0eac61d9f SHA-256: a4da9a0fa6ca8a64e98529959fa7791cca0f749336c58e2f44c48a7b5edf11ac
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirector infrastructure. One heuristic specifically flags it as a brand-impersonation credential phishing lure, mentioning WhatsApp and an abused redirector URL. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's used to direct users to malicious sites for exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xefavona.weebly.com/uploads/1/3/4/4/134463094/c3a748a.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/wix?keyword=career+research+paper+for+high+school+students PDF link annotation
    • https://cdn.sqhk.co/savageven/gfDBOvY/palapimizugak.pdfIn PDF document text
    • http://nogafadak.iblogger.org/new_ballard_score_sheet.pdfIn PDF document text
    • https://xefavona.weebly.com/uploads/1/3/4/4/134463094/c3a748a.pdfIn PDF document text
    • https://digikugububim.weebly.com/uploads/1/3/0/7/130774990/gisuziwaji-gisujeve-fukozumotewakis-vigurewududox.pdfIn PDF document text
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/855641.pdfIn PDF document text
    • https://zisojuvamifofe.weebly.com/uploads/1/3/1/3/131383842/9137247.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/ijgPPmf/tuner_gstrings_free_indir.pdfIn PDF document text
    • https://kukaweferoba.weebly.com/uploads/1/3/4/7/134754127/21228a9a060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namavorudil.epizy.com/60055654966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84608e1a-fdb5-470d-9785-386ac346a853/tevixomir.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_5e72a89ba8dd4e53aa758f4946a71b38.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_d2fbf9030f5f4db3944b86ae1d227a29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4813ee21-c0ee-4d7e-9ee5-380c2075d80c/44809665460.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/8236768045.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/67707868404.pdfIn PDF document text
    • http://koxaxoboxuzir.epizy.com/the_adventures_of_huckleberry_finn_mark_twain_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491efe06-1777-4074-abb4-6f1a9ea347b9/divatuxa.pdfIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_f0a805d6eb374be3b73f948406fb054e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/lodger_agreement_ireland_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a51810-cdb2-40a7-953a-334bdd18d290/funny_d_and_d_quotes.pdfIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_60386e0be9a64b32982251c3945e3cbc.pdf?index=trueIn PDF document text
    • http://daxipazomodej.epizy.com/67596171132.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/whatsapp_for_pc_terbaru_2019.pdfIn PDF document text
    • http://jipiroto.rf.gd/wujowamaferef.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_4c94e46375e8485189d82a1482965020.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 5320 bytes
SHA-256: e193b2b0999805a1f3b84bfce6074d4aaeff52d4b2a310d4a7fa20d3224da518
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 10984 bytes
SHA-256: 027acbe314e08a04d2aba29a279934a4667ee6e65e0e82e652edbae3819d5412

Open this report in the interactive analyzer, or submit your own file for analysis.