Malicious PDF — malware analysis report

Static analysis result for SHA-256 98619c39950bf983…

MALICIOUS

PDF

77.2 KB Created: 2021-03-11 04:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 521a867deeddcd85191114e020834032 SHA-1: ec557a67603e2f71b891f28f0ba9ca4f230b585e SHA-256: 98619c39950bf9830882286715e02cedc33f0a0f28d5f361aad12bbd51c4f21d
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=articles+of+incorporation+maryland+form
    • http://lolebunefa.iblogger.org/mebivugusumivexipugir.pdf
    • https://static.s123-cdn-static.com/uploads/4450345/normal_5fec310973ce2.pdf
    • http://zumufufup.sportsontheweb.net/wajozufafedoli.pdf
    • https://cdn.sqhk.co/busibelifiv/hgfjdlQ/dna_cross-_linking_agents_as_antitumor_drugs.pdf
    • http://rajonilelubej.22web.org/95787368935.pdf
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fed7aff7cacc.pdf
    • https://cdn.sqhk.co/luginuwi/i6Xhaic/93946498297.pdf
    • https://wagidojinubem.weebly.com/uploads/1/3/1/4/131438567/bbb2ec7b11d.pdf
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/sipiza_xatirenesis.pdf
    • https://cdn-cms.f-static.net/uploads/4451356/normal_601226047531c.pdf
    • https://bimelubisazabe.weebly.com/uploads/1/3/4/4/134492892/9496786.pdf
    • http://tatuxuvoziparu.mywebcommunity.org/58877563269.pdf
    • http://raponikidosal.getenjoyment.net/safidajaze.pdf
    • http://fovikoxesaweziz.medianewsonline.com/tattoo_artist_books_closed.pdf
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/losanigikizigav_pimuzujiv_bujokalivokum_vapijulev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_b555b81c72174cbcad6d872a4c608c93.pdf?index=true
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_a07355f56e954c5b9a99c89dcfc55d2f.pdf?index=true
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_aea36f5f38b7486cac28d604ed8c9d74.pdf?index=true
    • http://fojosotum.myartsonline.com/fistulas_perianal.pdf
    • http://bibalaluroxute.epizy.com/bhaagamathie_tamil_movie_video.pdf
    • 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_off0000f029.bin
eca9c0cb349056995a5994b2e192e792c943a9f1271b20b2adaeb410c595e673		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 5392 bytes
font_01_sfnt_off00010276.bin
6126ac655ae26d3116657cc679f5b7457d8b0aa82a17241e845e93c1ab121800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 10672 bytes

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