Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2125058861fec5f…

MALICIOUS

PDF

81.5 KB Created: 2021-04-06 08:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 88e7a2c3398aeb664796f3955ef86eb1 SHA-1: b2e29f74e9f9ce07869afba2f679af763868c2d3 SHA-256: c2125058861fec5f178fd9df4e55f5411b3c3bfc31f66390ab3e77a9555d148a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=fraser+alexander+pdf PDF link annotation
    • https://waxovidimised.weebly.com/uploads/1/3/4/4/134446407/69f61e6f411cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_603781fe4ea50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_601dff15bac52.pdfIn PDF document text
    • https://paxepufa.weebly.com/uploads/1/3/4/6/134640660/4158095.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412415/normal_5fc64d1159963.pdfIn PDF document text
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/4277077.pdfIn PDF document text
    • https://revegeworosopo.weebly.com/uploads/1/3/1/6/131637057/21514bcf962.pdfIn PDF document text
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/424de40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_603f16a175928.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/iYhfjfw/optigard_ant_bait_gel_lowes.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/lusafudak.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/rHchg5l/alien_art_farm.pdfIn PDF document text
    • https://wiguvebilef.weebly.com/uploads/1/3/5/3/135389097/932422.pdfIn PDF document text
    • https://cdn.sqhk.co/mutavewituro/jb7he09/10720252422.pdfIn PDF document text
    • https://rawubewo.weebly.com/uploads/1/3/1/4/131405976/6491090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fc689e29e3bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jutoxuriwiloja.epizy.com/jinevugezigabigadoroler.pdfIn PDF document text
    • http://vibiputis.epizy.com/comment_combiner_plusieurs_en_un_seul_mac.pdfIn PDF document text
    • http://musowafotoxipid.epizy.com/curriculum_vitae_samples_doc.pdfIn PDF document text
    • http://pujusojup.epizy.com/dufebanagajo.pdfIn PDF document text
    • http://dujepuxa.rf.gd/limesurvey_css_templates.pdfIn PDF document text
    • http://ledaxefamadore.epizy.com/98340020058.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_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 5060 bytes
SHA-256: 41cd2f5d965a1bfceb2af8520f8025e5a9c005ac1a080e7d48ba489f3e99c09d
font_01_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 10592 bytes
SHA-256: 2c48e3022585679642909bf69269e2c01311ff13b2528d3421f676ed9820848f

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