Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a73a75089ce91d…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 08:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 67183abe9fa46103c735ba0477d9e4f8 SHA-1: e0077ad6ad8a714d4bb81ee8f5830a9460774472 SHA-256: 59a73a75089ce91d7794e8ed57866d6abadc29b984f168913203275b079463d8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as a phishing trojan. It contains a large number of external links, indicating it functions as a link farm designed to redirect users to potentially malicious websites. The presence of numerous URLs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=azan+alarm+app+free PDF link annotation
    • https://cdn.sqhk.co/bosesegivu/fgdjhhd/makipufeninul.pdfIn PDF document text
    • http://bepibolet.22web.org/french_english_pronunciation_guide.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/6198370.pdfIn PDF document text
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/736303949c1c.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/hSQhZge/12377584663.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/hmij9hc/lemon_bundt_cake_recipe_gluten_free.pdfIn PDF document text
    • https://nujazovarurep.weebly.com/uploads/1/3/1/8/131856890/lividigolij_tizidinisep.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/vDigRAs/22940068170.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/pemukewarel_molibopuros.pdfIn PDF document text
    • https://gomepenet.weebly.com/uploads/1/3/0/8/130874128/zuvuwowaro-kijodifamedepi-fefuke-roxenej.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwozigef/ihxJhcJ/bodanilodawitokek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_42f5f02edcf24469ad265958f8a69b32.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_aaa7a6c2e27e4cec9eebd57dc679c45f.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_98fbbb26d7aa49fc976c5d1fe667ed1c.pdf?index=trueIn PDF document text
    • http://pokezuturev.rf.gd/watchman_nee_biografia.pdfIn PDF document text
    • http://nokemufebevezo.rf.gd/logudokuweniguvofa.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001031d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1031D 18964 bytes
SHA-256: 8ab35ad163718a53755156552bd014f91175276451ae3d5aaae40138a056a4a9
font_00_sfnt_off0000cc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC79 4908 bytes
SHA-256: 4a6dca4c32bb4ebc04e367c498f9eb032241f22964ca1ae302b2616781e3562b
font_01_sfnt_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 11092 bytes
SHA-256: be29baa9814c16272051400ae0fb79592726e05149ca593dc5ce9f27ebe3791f