Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f264068be46df85…

MALICIOUS

PDF

147.2 KB Created: 2021-02-15 19:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7803698136eb8571cc0b2735627c94e SHA-1: d493cca5005a901d1f98ebc830b0a6d3d1a21887 SHA-256: 1f264068be46df852d95b3d5c4bf02aafd190622c5fd13deafb2aec13681e328
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=whats+a+cvd PDF link annotation
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/2882577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5fe6f7bf9e264.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/767f14896a0245.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/hbeWihw/king_of_avalon_cheats_codes.pdfIn PDF document text
    • http://pizidojokinesa.66ghz.com/clasificacion_de_anemias_en_pediatria.pdfIn PDF document text
    • https://cdn.sqhk.co/daxutoxod/hJiiWjg/smartphone_tycoon_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ff6ae023becc.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/Xlibjgh/blocktopograph_for_ios.pdfIn PDF document text
    • https://bevufivob.weebly.com/uploads/1/3/4/6/134669401/877072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486033/normal_5fda456eaeaac.pdfIn PDF document text
    • https://xuniwinasifobip.weebly.com/uploads/1/3/5/3/135302293/vujik-betaxokivilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404500/normal_6003f131be4dd.pdfIn PDF document text
    • https://torofijode.weebly.com/uploads/1/3/5/9/135978969/kowerapefironufebavo.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/zotitipepebevejig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ridabus.epizy.com/san_diego_zoo_animal_planet_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/dezasugo.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/gisizuwejawakowarezatu.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/five_ten_tennie_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/ligularia_reniformis_toxicity.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/puduxavufev.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_off000205b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205B5 4972 bytes
SHA-256: d85181f913d2f3464ffecca70ce8216eddd5a80f1ec1e3e5d27cd4274b3ade60
font_01_sfnt_off000216ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216AD 12292 bytes
SHA-256: 9eb65752e7ee10cb8c1be4c8188b4df2638a08ac0e1bd1fbefcde4d5fc7b30d4

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