Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e0f2c19c8c4794…

MALICIOUS

PDF

75.2 KB Created: 2021-05-20 18:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5231789444d143cd889086985419d726 SHA-1: 3dcd9c9f62034ca3ba86c4c4570be7d18aa7c683 SHA-256: a9e0f2c19c8c4794c46e561877bfc32b6147d7aac32cf47cf5aa75ce79e19f27
254 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a credential phishing campaign, impersonating Microsoft to trick users into downloading a template. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/8483316.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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=past+employment+verification+form+template PDF link annotation
    • https://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/8483316.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/7973828.pdfIn PDF document text
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/83b51f.pdfIn PDF document text
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/521257.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/191a02718a3563f.pdfIn PDF document text
    • https://damupese.weebly.com/uploads/1/3/4/4/134492451/7090765.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/zegaruwa.pdfIn PDF document text
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/1501384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c52954-1729-4b9a-815d-93182dd8492a/53175395354.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/gonakexovagojexevoxofoliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b176e130-306a-40f7-bc03-39fb950e8c04/zenewezazuvevisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecc5ff2-1521-4999-9d25-9b88991f4471/29920808262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58554456-5687-49a9-93a0-fdc216a6f45e/the_case_against_education_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ea24dd-aa92-46f1-a501-7b985bd87d13/depugarifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16561929-2baa-4d5a-a60f-66ecf861959d/the_argonauts_maggie_nelson_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f91a1cd-3f04-4086-8815-395f990910a5/how_to_read_the_dark_knight_returns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03356b9a-f633-4ae5-9509-30c42187e39c/percy_jackson_and_the_titans_curse_chapter_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203daf49-1ea6-4809-8f09-4653a07bf436/30729055174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f853d8-5b9b-4f10-afbc-5e6cee0c2932/36735433497.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/78455541248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc968e02-c745-4b86-9ed5-f5bd9f96d124/list_of_all_english_conjunctions.pdfIn 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_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 5324 bytes
SHA-256: 4a66d6f92c2561290f0ea77e142b8d4b500d19490fba050169b9e34acc33358c
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 10520 bytes
SHA-256: 13be58b1b74f24ffee28fc6dbcd8e0c6d2a44f164be918b7e491b34f3d2143b7

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