Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc174004ff74554…

MALICIOUS

PDF

91.0 KB Created: 2021-04-03 17:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bf7cea29be1259c813ed5a13c7a2e1fe SHA-1: 7259464ee609cbe20035fb889397ef49f5d8b668 SHA-256: efc174004ff74554bd2be49a3e2b0bb2c849ee94b5dafa7fdba9e86d9d188989
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm or SEO scam. The primary external URL observed is https://nipisod.ru/award?keyword=anti+reflection+coating+principle+pdf, which is likely used to direct traffic for malicious purposes. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/award?keyword=anti+reflection+coating+principle+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410443/normal_6004f31e1c6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_600f21278bdb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468838/normal_5ffe2e1f62a99.pdfIn PDF document text
    • https://dejoputaxili.weebly.com/uploads/1/3/4/7/134763817/5181742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391896/normal_5fcb1da5f0d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_605716d8be283.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/c5cbc8cd8b947bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_60373a68c35d1.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/3a0327.pdfIn PDF document text
    • https://vukuxonujifated.weebly.com/uploads/1/3/1/1/131164545/8fdacd68507d002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601dd1493e03a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5fffb90b9bc0f.pdfIn PDF document text
    • https://nuwevalixur.weebly.com/uploads/1/3/5/9/135990129/3970381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_1b33e51dceca424a9b7bc458b9c0ddbb.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_3e12354728b44353ab3604ac148578dc.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_e152166fa8334815bc8f5878e16a5e08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd110a4d-6c25-4db0-97e8-9492d30e118c/nepaguramilobawoze.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/getetefejupazivepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf45646-7f43-41bb-9a69-6002dbe837c9/amsco_ap_human_geography_chapter_3.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/how_to_play_multiplayer_goat_simulator_on_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/7178276671.pdfIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_007392f7b7944cafa3261c45ede3d98e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/77319982093.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/bahubali_3_full_movie_2019_free.pdfIn PDF document text
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_edd223dcbf5e45babfa4e1060d88bdd3.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_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 5136 bytes
SHA-256: 946181d633fe86ff4b1b7faeb8ca25a72f1e6a4b7e2ebc440a224f76b8b64eef
font_01_sfnt_off00013677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 11892 bytes
SHA-256: 7bf90d54a5cf4984bdd90d64a6b8bbe5b016636cc604e67c7977766dd8eb5c16