Malicious PDF — malware analysis report

Static analysis result for SHA-256 623f96caeeac6949…

MALICIOUS

PDF

76.5 KB Created: 2021-03-09 19:04:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 053ae90d30b78a5f3913e89e7138314c SHA-1: 2b2b08891ae8313502fef88233f0a0eebb5198e6 SHA-256: 623f96caeeac69492ba4850cea2980f03d74c25be2a0f256cc98b09212244adb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The presence of a URL with a 'utm_term' parameter related to WordPress login issues indicates a potential phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely to redirect users to malicious or spam content.

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://resalured.ru/aws?utm_term=wordpress+login+not+working+after+url+change PDF link annotation
    • https://cdn.sqhk.co/kalijada/6LBhfif/dojefixarezimebe.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/hcXUiaX/basketball_strength_and_conditioning_workouts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_600e03172a3c1.pdfIn PDF document text
    • http://thepropheticapp.com/99857935366ltgc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_5fd0f9b905bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_60272474f3944.pdfIn PDF document text
    • http://coloradocustomelectric.com/red_cavalry_isaac_babelcnct6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopivenegi.epizy.com/43486592215.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_84ada10592d34600a65ff4eac6240ca1.pdf?index=trueIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_3cb5bd334e9c445bb92aab6ed2962a5c.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_7671475aca93474fb5179d0166f3878b.pdf?index=trueIn PDF document text
    • http://moniladipawi.epizy.com/59833408297.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_13e2923a782a48bd98ed99685abbb4e7.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_d84352d1ffc64f238d39251fb77050af.pdf?index=trueIn 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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 5588 bytes
SHA-256: 9d91989758c7424c8c18d75ec3adc83601239be8de0de8e93b9d1a1684a903ae
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10444 bytes
SHA-256: cb5cd65359d3e2b88576084776924d7b0eac38e583d6ced791307d8f5e15a515

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