Malicious PDF — malware analysis report

Static analysis result for SHA-256 428293b6721b73bc…

MALICIOUS

PDF

67.9 KB Created: 2021-02-03 00:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c9e4aeb64d2725ffa376a9a728ee7165 SHA-1: d2d37f0c29029b2b474f533fd39428a9863ce150 SHA-256: 428293b6721b73bc5503fd8079d3bfe50363c2c374bbce761485ce1bc68792f7
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, many hosted on disposable domains, strongly suggests a link farm or phishing campaign designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attack pattern involving user redirection.

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://baarspo.ru/123?utm_term=gwork+for+public+health+education PDF link annotation
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/xenunifiwosezim.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/dotiguxagugim.pdfIn PDF document text
    • https://jajadonafusava.weebly.com/uploads/1/3/4/0/134040597/tavobuwagid.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/3594110.pdfIn PDF document text
    • http://alcexpress1.xyz/50227832079c7kd0.pdfIn PDF document text
    • http://umniashka.ru/simpson_260_vom_manualz6hnl.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/6588968.pdfIn PDF document text
    • http://znatural.space/a_quiet_place_subtitles_english_downloadrv50r.pdfIn PDF document text
    • http://requiremcgood.com/janexetajodj4ir.pdfIn PDF document text
    • https://kuludiliwalu.weebly.com/uploads/1/3/4/4/134484861/zogenevesamiv.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/6709774.pdfIn PDF document text
    • https://nebekateri.weebly.com/uploads/1/3/1/1/131164314/wazobiser.pdfIn PDF document text
    • http://trikolor.site/vozokosobapimixasemosivos504u.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/4cb1162.pdfIn PDF document text
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/vemizubifiji.pdfIn PDF document text
    • https://wojebera.weebly.com/uploads/1/3/0/7/130775791/joralopelugos_padefiloweje_nonogewaz_fofuxexama.pdfIn PDF document text
    • http://wonnaturila.space/vobanagetilolojenalopoxaerv3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/bedjet_v2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/kazobusopi.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/50555395092.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_off0000cb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 5392 bytes
SHA-256: fdcf31f26bd41c017dd9ca88afc5ee0519729545251e878c062fe36452e8bc09
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 10764 bytes
SHA-256: b6659530a2ad46252b655d0a87ecd91b51232540ed0c869a19e297c2cf0d2f9a

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