Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e69aa670a778f11…

MALICIOUS

PDF

86.4 KB Created: 2021-03-31 04:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4dd38be9b1d6a8ec7c5a871d0bac5ebc SHA-1: 0f9cb9220613247b9b49bf8715154f0c319d1f9e SHA-256: 0e69aa670a778f11271892e4de1a08f1de3f281a88941f733bd24b2f86cbdeba
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://dafemum.ru/strik?utm_term=define+corporate+identity'. Another critical heuristic indicates a PDF link farm, with 'https://s3.amazonaws.com/defujo/vawavi.pdf' being one of the many external links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=define+corporate+identity In PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/hjgxmhg/28860543462.pdfIn PDF document text
    • https://cdn.sqhk.co/daguvemet/gdghhda/sotuvunexabejabokug.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/KHohfje/66467328324.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/gjghjet/jutow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/defujo/vawavi.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_bd848dca51cb4179905278b040933d65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/walk_in_the_moonlight_malayalam_song.pdfIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_0b2fae244ce8427b84772234e4f795a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nalifij/fudanesebilogodazejeta.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_ece367dd2b854b738f289bbbc73c67e5.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_e8ea1bed647740e187d8ee0c8044d160.pdf?index=trueIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_c0c0bf786a464cb09a22290940afe233.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/is_kno3_a_molecular_compound.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_088c4f50112b42f79fd161e17dc48c26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/fusalovoxutafeguzujabul.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/95939085071.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_cfb8af90ffd748c2b7e5091c2a510d46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luropi/vipolej.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_b7eb0bc66a834f179a505b08464250f8.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_d370ea45328d44499c9d2781112e5171.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_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 5040 bytes
SHA-256: ff524465ac74123b23ab40022e844de164d2050d8dbb30028e33e441d59e0653
font_01_sfnt_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 12324 bytes
SHA-256: 3ac50fa8f3af54c4189ade276a22bb62774313e9ee875a41952a966576eccd77

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