Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4024194ab1bbdf8…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 17:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d381bb4c654f4a2bda2b25e2184984c5 SHA-1: 76356e0db960f5e390c29a0737eac12b62546bc2 SHA-256: c4024194ab1bbdf82fcda35b4089d8085cd6056c394ca93757d8093e7d231467
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious redirection or content delivery, potentially leveraging JavaScript for obfuscation or execution.

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
  • 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://dafemum.ru/123?utm_term=excel+vba+msgbox+yes+no+cancel
    • http://babbieshop.ru/3123869363719gwn.pdf
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/dijuzukotutobeduneni.pdf
    • http://mixutadumekaje.mypressonline.com/machine_shop_math.pdf
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/peboliwurekew-xalajukagogu-gadow.pdf
    • https://budemarapi.weebly.com/uploads/1/3/1/3/131381681/5d1078d66.pdf
    • http://nikecortez.net/ncert_class_10_english_grammar_book_downloadrtoez.pdf
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/wutek_sububedaded.pdf
    • http://nigma24invest.online/digestive_system_worksheetcthxp.pdf
    • https://giwemonuxir.weebly.com/uploads/1/3/0/7/130775654/dedupurivezorod.pdf
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/b60a6d5ef65ae.pdf
    • http://jiwapadenejeza.getenjoyment.net/53140033034.pdf
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/5942173.pdf
    • http://consumer-data-protection-bureau.com/apset_model_papers_with_answers4e7da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kefodek/captain_tsubasa_dream_team_mod_apk_terbaru.pdf
    • https://s3.amazonaws.com/lazolu/calculus_textbook_answers.pdf
    • http://namakanexir.atwebpages.com/sunamatemesafub.pdf
    • https://s3.amazonaws.com/divelikubapiwaj/gate_book_free.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_off0000ef6a.bin
6e8bf300d040b22b7488dbda3c57f48386bb851065f22886a6c90c8bb8cc7054		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 5352 bytes
font_01_sfnt_off000101a4.bin
3dad1221fa572ab47ca5f344834ee4c8e00cb34807e2e107c62771fab3e68a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 11004 bytes

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