Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae74356cbfea0ed9…

MALICIOUS

PDF

73.8 KB Created: 2021-02-08 10:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3714f9ce879ce9753f44e8c0b3541a41 SHA-1: 49a7f08fbeb228d694dc5846d5bbf1bf93f9ab64 SHA-256: ae74356cbfea0ed99584ffeec9c703441879a875fddaddbdd5b828b9e5810c90
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of multiple external PDF links and the detection of a 'Phishing.Trojan' by ClamAV suggest that this document is likely a lure to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/aws?utm_term=bhojpuri+movie+video++2017 PDF link annotation
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/fixugasabos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5ff2da8cf051a.pdfIn PDF document text
    • http://rrrrkkkkk.space/upstream_student_s_book_b2_answersuv1xo.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/hgcqFTA/33490651830.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/khg5Phh/heavy_metal_radiosender_frequenz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371244/normal_5fc7f80a2e42c.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/C2qiegQ/rareform_backpack_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/hiijjie/64670257956.pdfIn PDF document text
    • http://nibelv.xyz/revidorilew4xpb.pdfIn PDF document text
    • http://logmeinnow.xyz/algebra_nation_workbook1znqx.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/ihgC7Aw/35233873111.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/ihw08hi/30608646011.pdfIn PDF document text
    • https://cdn.sqhk.co/jidobimatu/iNNicDG/paypal_prepaid_app.pdfIn PDF document text
    • http://vas-rem.ru/how_to_remove_password_protection_from_mac1v5y8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_601d7a53463c3.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/haMhgDZ/absorption_coefficient_of_crystalline_silicon.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/paxivogedewilu/bajasisopurutebabufe.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/tivalasebusetikokerovasa.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/29703225963.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_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 5368 bytes
SHA-256: 0fc4c09a9ae55b6b1039ab293ddebca6c1702af63873187c54e8f86380d064b0
font_01_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 10104 bytes
SHA-256: 9eb16ad67d0ed59748e101e8d2bca7489228047a61f595559f75e8c91a79fb5c

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