Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58011ae437ac6fd…

MALICIOUS

PDF

90.6 KB Created: 2021-02-23 03:34:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 19ac002ff6f53cb3c7dc84f95f1a9272 SHA-1: 44aa1bc7805d78085e2b021932400c13ffd66cec SHA-256: f58011ae437ac6fd4106560afc59bd314f226e0398bee62fc4701cd19fdd619d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded content, though heavily obfuscated, likely serves to facilitate this redirection, potentially exploiting PDF vulnerabilities or embedding malicious scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/aws?utm_term=what+instrument+is+used+to+measure+surface+finish PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479933/normal_6013c4d4d9697.pdfIn PDF document text
    • http://nakavadibukukep.22web.org/medical_certificate_format_for_leave_bsnl.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/e59b1c97a414.pdfIn PDF document text
    • https://lifoluzasodani.weebly.com/uploads/1/3/1/4/131437418/zafudojajikor.pdfIn PDF document text
    • https://vigenuwotefi.weebly.com/uploads/1/3/4/0/134012497/4418558.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5ff07913e96b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473890/normal_5fcbddcfe1fbd.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/6438862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_6034354fcd597.pdfIn PDF document text
    • https://vemegerefawobe.weebly.com/uploads/1/3/2/6/132682093/5578506.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/zofibenosaxe-budotakuka.pdfIn PDF document text
    • http://pekokaxa.22web.org/scary_campfire_stories.pdfIn PDF document text
    • https://farejebizaf.weebly.com/uploads/1/3/0/8/130815013/5491437.pdfIn PDF document text
    • https://gajebafanagifim.weebly.com/uploads/1/3/2/8/132815836/tewilamoge_fonenikelux_jaliwujobukiref_savuwitedezuj.pdfIn PDF document text
    • https://rizipopene.weebly.com/uploads/1/3/5/3/135316145/xetadawu.pdfIn PDF document text
    • https://rekixalegupu.weebly.com/uploads/1/3/2/7/132740488/ximoxaxamunewin_vezep.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/fatikonavori/86821319871.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/osrs_dragon_gloves_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/xasugizut.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/transformers_dark_side_of_the_moon_barricade.pdfIn PDF document text
    • http://fokafupu.rf.gd/first_alert_co400_carbon_monoxide_detector_battery_operated.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 3016 bytes
SHA-256: 07efd4b5ce35fe43d562a47bea6ca2be7e52a32f6dbf0d49a2a72276c44a66d1
font_01_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 5124 bytes
SHA-256: f33c9ac559c481c0d79aebd70872db6d7ff304edb45e7ce720ab941a34d26b68
font_02_sfnt_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 11460 bytes
SHA-256: f6b17eae8133017ad4a118b27ff455a27aa8d27f7f6b704075d10f9dcf47249b
font_03_sfnt_off00014def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361