Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56807326f55534f…

MALICIOUS

PDF

121.6 KB Created: 2021-03-23 17:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9a6b61ccbfe72423a151dea557388c12 SHA-1: b82c00b8dd3403028a0e21a8e17ab2ff6964dd20 SHA-256: f56807326f55534f8861b9fb5237de7e9092be61e7e1ae4d641a70620a71fe56
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute traffic. The document's content, though heavily obfuscated, appears to mimic an annual report to deceive users into clicking these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/123?utm_term=electronic+arts+inc+annual+report+2018 PDF link annotation
    • https://cdn.sqhk.co/guranotup/gdOihVS/83586071300.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/3blXKJw/zizux.pdfIn PDF document text
    • http://xikewimuvos.iblogger.org/lefulagezerovun.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/gvjiie5/doragivizexamujisiviv.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/fjjhaja/461036162.pdfIn PDF document text
    • https://cdn.sqhk.co/kafosine/icgeijd/95013661585.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/iazia9e/23625027895.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/heihKii/rulopibum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafatakijuton.epizy.com/novavozefaberewobaf.pdfIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_3dd29dd0140a4db287d96f85cbb7a376.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/sony_rx100_vi_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/chamberlain_hd900d_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/apple_cider_nutritional_information.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_845d2d285197493bbbb59fefc0bbf2f8.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_141e0b69342644faaa66ead216c18386.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_bbba13f9e46f47a8a6c53d4286d17751.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_5f3cc5b39a234583a67af5093c2ea1db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/futamo/alsons_aws_information_systems_inc.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/karnofsky_performance_scale_kps.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/how_to_thread_needle_singer_sewing_machine.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C8B 5404 bytes
SHA-256: c670a7b10e06b1d2375d5cddd5899559a9b84e91f310980a9e7ff41715a060db
font_01_sfnt_off0001aefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEFC 12252 bytes
SHA-256: 6034f65f3124065ec3c9f1d2673a1ec8c5973a28529e37397fe84b0dc91ec583

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