Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73971af4840cd1a…

MALICIOUS

PDF

87.8 KB Created: 2021-03-17 20:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 729a3a35c9f46838072f07f70eb36e58 SHA-1: 23ac7e596a11a8bbf0b0b76d1e2823d13626b619 SHA-256: b73971af4840cd1ab6f9349b6e70145fa21cc09d6c50025663c89f9041cdf38b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it functions as a link farm or a phishing lure, directing users to potentially harmful websites. The embedded content, though heavily obfuscated, appears to be related to search engine optimization tactics, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://nipisod.ru/award?keyword=bacillus+cereus+adalah+pdf
    • https://zufezoro.weebly.com/uploads/1/3/4/8/134885884/fepari.pdf
    • https://cdn.sqhk.co/xunijejozi/dEttc8K/nipiko.pdf
    • https://cdn.sqhk.co/kozutani/cFNsZic/anorexia_restrictiva.pdf
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/1237398.pdf
    • http://lifolibi.sportsontheweb.net/classroom_management_strategies_for_middle_school.pdf
    • http://pofaduxiruk.getenjoyment.net/best_stock_for_2020_reddit.pdf
    • https://cdn.sqhk.co/wubejiwixu/ieqiicA/whatsapp_messenger_apk_for_android.pdf
    • https://cdn.sqhk.co/jukelifawap/2iczidD/41466524727.pdf
    • http://lirinevewafa.mypressonline.com/audit_bureau_of_circulation.pdf
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/lojufu.pdf
    • http://gudokav.sportsontheweb.net/how_to_install_triple_thermostatic_shower_valve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2d2259bb-e317-44c9-9705-9e61a2248c30/post_mortem_of_a_protagonist_macbeth.pdf
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_8ebc018cb57d45c3aaf53799993ee9e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1efa3785-44e9-4167-9039-fe16aa35be11/writing_ionic_compounds_worksheet_answer_key.pdf
    • http://xiwozoget.atwebpages.com/78138628362.pdf
    • https://uploads.strikinglycdn.com/files/59d339fb-aced-40ae-9b2b-b8fc3e0a6d95/gumoxuxafemebofuf.pdf
    • https://uploads.strikinglycdn.com/files/24eea6c1-53e4-429e-b1a1-725ef98b833d/kung_fu_panda_2_cast_lord_shen.pdf
    • http://kilarosine.atwebpages.com/how_much_are_40_inch_tvs_at_walmart.pdf
    • https://uploads.strikinglycdn.com/files/a497a249-6284-4e80-803d-72b2ee7e3a24/12778689916.pdf
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_26b0de761fe04ece8e84c1fc3cc05103.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a41.bin
27754f08bce2ca957247b4ff8653c27fd4f458fe06cc081c1cbc1692e968f89d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 5292 bytes
font_01_sfnt_off00012c37.bin
67f9990a29e3125f9f580d04b11a11e7786b0ee57849664da99e50a3b360cea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 11168 bytes

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