Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfb65f8638af2df…

MALICIOUS

PDF

75.3 KB Created: 2021-01-05 04:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ce026245f052e4d939458b46de6750f5 SHA-1: 2113aeaeaf6e0307be3ad1f1a3f04f4d7bded001 SHA-256: ddfb65f8638af2dfd4eb04201caceb3de2260934a32b398926c293a0bdb854cd
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains keywords related to accounting and reporting requirements, likely serving as a lure to direct users to malicious or spam websites.

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://trafffi.ru/aws?utm_term=senior+accounting+officer+reporting+requirements PDF link annotation
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/6922797.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/f90bfcf4821.pdfIn PDF document text
    • https://zerexima.weebly.com/uploads/1/3/4/6/134643072/c17b4fe19a56c97.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/adf62a248b.pdfIn PDF document text
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/basitane.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/ace953a225f9d.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/palumixof-pawisewifuzon.pdfIn PDF document text
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/sifapi.pdfIn PDF document text
    • https://tokitowopune.weebly.com/uploads/1/3/4/4/134498993/9791147.pdfIn PDF document text
    • https://cdn.sqhk.co/lebereme/Bge4ghC/labyrinth_of_refrain_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/XbRdHnA/call_of_duty_warzone_apk_download_for_pc.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/2647091.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://s3.amazonaws.com/jewizopukuni/hvac_sheet_metal_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/gauge_to_mm_indian_standard.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 5416 bytes
SHA-256: da656889b7884a46b21f5bc05efa98ddd84390f735cf55b61321770649b1b8dd
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 10560 bytes
SHA-256: 903538c3258d51f39a2003e6c1a7bc3c7eb8d534145fe7b6cd1469b85ff6c481
font_02_sfnt_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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