Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e1b04495ebcd06…

MALICIOUS

PDF

69.5 KB Created: 2021-01-30 02:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ae5c908f727a7eed15414348577bb702 SHA-1: 96dfa46a169b775d1f33e907a50891268ff6c2d7 SHA-256: 56e1b04495ebcd069384f43804ae1f99b6e181884f0394ce8149a1b1c966e5ad
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'traffnew.ru' and a keyword suggesting a lure related to 'strategic human resource management'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document is designed to host many links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest it's a phishing or downloader document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://traffnew.ru/wb?keyword=strategic%20human%20resource%20management%20mello%20pdf PDF link annotation
    • https://cdn.sqhk.co/ruwonumatag/gdgjjj9/59536851671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_600fcae83046f.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/c1d1274e.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/dhcH8vB/glass_breaker_tool_for_car.pdfIn PDF document text
    • https://dukuvewag.weebly.com/uploads/1/3/4/0/134041028/wuxojutigi_lajotu_maluxas_regoxofomuz.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/ji0vJhf/15051518415.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/TqIB6P1/lisor.pdfIn PDF document text
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/kisomusi_bovesosixi.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/xitowopedarodogo.pdfIn PDF document text
    • https://wojagezut.weebly.com/uploads/1/3/0/7/130775605/gezokafunavemevikila.pdfIn PDF document text
    • https://falototadapi.weebly.com/uploads/1/3/3/9/133989324/305140c216080.pdfIn PDF document text
    • https://cdn.sqhk.co/gumoxixo/R2CAbmM/javojikireradupi.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/jcjhhgh/train_layout_control_panel.pdfIn PDF document text
    • https://mopawikivitofa.weebly.com/uploads/1/3/4/3/134347346/mepapujopifas-sasukutalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5ffe43206bf4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 5672 bytes
SHA-256: 9f50a9435c8fcc03124cbf02d229506cf4a1d40dc1cca45fdfb0db25f1ff7563
font_01_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 11316 bytes
SHA-256: 6f1a26d3d8c83e1177733af66b15599b92b2ce0b718e09fc319fed15c653471e

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