Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8ba4c2e585cdc6…

MALICIOUS

PDF

81.5 KB Created: 2021-04-06 10:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b75b53fed74002ecbf8b071b428d22fa SHA-1: 72089d01a685807701f2867032deb64c16f4beca SHA-256: 0d8ba4c2e585cdc66d095bfaa8232fc90f5666082d4fbfbc9c65a3df0d1fb5a3
212 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a deliberate attempt to host a large number of external links, likely for phishing or distributing further malicious content. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the document body's garbled nature and the presence of embedded URLs suggest a lure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5384

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=salary+for+front+end+developer+in+india
    • https://cdn-cms.f-static.net/uploads/4393190/normal_60598a66e3543.pdf
    • http://doucheop.xyz/the_power_paradox_book_reviewlujpe.pdf
    • https://cdn-cms.f-static.net/uploads/4476564/normal_604d6266d1b9a.pdf
    • http://rentline.pro/29949287589lje55.pdf
    • http://contentmedialiteracy.com/how_to_return_to_sender_an_emailn4mze.pdf
    • https://cdn-cms.f-static.net/uploads/4414152/normal_604dd339ee7d0.pdf
    • https://cdn-cms.f-static.net/uploads/4369502/normal_602aef319b853.pdf
    • http://zugemenelil.medianewsonline.com/16083577025.pdf
    • https://cdn-cms.f-static.net/uploads/4426822/normal_6058336c70ece.pdf
    • http://persequenteamsohbet.com/korean_childrens_storiesgw6zr.pdf
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5fca8e1d5eb89.pdf
    • https://static.s123-cdn-static.com/uploads/4465142/normal_5febb47d548a4.pdf
    • https://cdn-cms.f-static.net/uploads/4471683/normal_601f0ccc0f3aa.pdf
    • https://static.s123-cdn-static.com/uploads/4427506/normal_6008a5dcbda76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_275fd09dbe1e470ca184fa6db5978a9b.pdf?index=true
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_a614c8a671a14d1191eab0107ee42581.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5f265e1c-f4ab-4b72-8857-f9174af0d159/student_exploration_distance-time_graphs_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/90e9251f-7bb6-4ac5-8f37-4068217aa338/warokedabariv.pdf
    • http://pugazapuxijal.myartsonline.com/setodesinosififugo.pdf
    • https://uploads.strikinglycdn.com/files/47d4d048-208e-46f0-8e2e-4b4f4f351bc8/jebetavawufewisonubomo.pdf
    • http://lonesopuw.onlinewebshop.net/51797047025.pdf
    • https://uploads.strikinglycdn.com/files/ce5f8dde-a06d-461a-95f5-2fc1be0f835c/bible_study_for_newly_married_couples.pdf
    • https://uploads.strikinglycdn.com/files/4aa2aa42-cd03-47d4-907a-c7fc195b7e5c/91183015706.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001058b.bin
d5eca8f050a7a8b02b9fcb72ff97802406bd3c68257b4421d3517dc50f91cd23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 4912 bytes
font_01_sfnt_off0001164d.bin
739672943ce7e0a12101e908040158ac18cc8927491f48c2c0f57ec37f180b2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 11424 bytes

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