Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc7ddcb4cc03d92…

MALICIOUS

PDF

78.4 KB Created: 2021-03-14 16:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 37221d10a6201566504ee62ef6e2fd61 SHA-1: 66466605e37aa9769c77a4653361623e1f7cbcc7 SHA-256: cfc7ddcb4cc03d924ca8b1988b8b9b8971e66eac2f7b2a90d069b261cf7d46dc
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=determinacion+de+acido+acetico+en+vinagre+pdf PDF link annotation
    • http://ukranews.icu/98177248400gya63.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/ajajbf6/42101116358.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/kubesaxoma-xetubifaw.pdfIn PDF document text
    • https://dipibuwedaji.weebly.com/uploads/1/3/5/2/135293441/14bf9.pdfIn PDF document text
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/1046299.pdfIn PDF document text
    • https://nusatugob.weebly.com/uploads/1/3/4/8/134865614/zegigexewufagawunem.pdfIn PDF document text
    • https://tuxufinuzeleki.weebly.com/uploads/1/3/4/7/134737217/xedubi-suwaw-kifut.pdfIn PDF document text
    • http://buybritishcat.com/example_problems_for_continuum_mechanics_of_solids12gvm.pdfIn PDF document text
    • http://padojuputiki.iblogger.org/21366368654.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/cJhaNK7/nipajilokapesafudalak.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/jiifjiy/61038237196.pdfIn PDF document text
    • https://cdn.sqhk.co/sisagoku/L7hefhe/download_lagu_odd_eye_circle_girl_front.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_368744d796cb41f59b2a8f0772d3bc56.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_3e03c2ff17a443cbab3a7f843ea53015.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf93da4-2e03-4006-a97a-fdb3c5011b75/sevuzujedufajakolima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a2f425-b472-4af4-95c8-1f622c0b40fd/kowoxo.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_f4c35edff3574adfa1698eede49fe9a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2f4476-bb67-4721-94f2-bca9a58eeb09/xukexezuraxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6593d835-9eae-445c-b3ce-fe9cda045e94/what_is_the_meaning_of_chemical_structure.pdfIn PDF document text
    • http://titizobilane.epizy.com/42615157494.pdfIn PDF document text
    • http://sejekaxupoze.epizy.com/77445210885.pdfIn PDF document text
    • http://davidoxikolud.epizy.com/the_other_side_of_paradise_dateline_full_episode.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 5112 bytes
SHA-256: 177fed054f99af3d0ddadfb72d8bc380fd5df2db28b068354861cfce322e7ded
font_01_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 13156 bytes
SHA-256: c9c448b7e8e0b807c9af8d0f8bbaf50ae1c65d0ec45c9837e906e562d34a627d
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2