Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5332850842ef35f…

MALICIOUS

PDF

82.9 KB Created: 2021-02-22 19:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 79cb2d97cba1cb1b6dce9a46f5861390 SHA-1: 12f8646cdbc15470a400beb71e24eaf2953ee1a2 SHA-256: b5332850842ef35f125295ec67d786fe69cb013d09f2af3536f5d274f0464fd2
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, appears to be a lure related to appliance repair queries. The presence of ML and ClamAV detections further supports its malicious nature, likely serving as a phishing document that directs users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=why+is+my+maytag+dryer+not+getting+hot PDF link annotation
    • https://cdn.sqhk.co/kumotuxijufu/0idghhc/8897204737.pdfIn PDF document text
    • https://nopuderegitiber.weebly.com/uploads/1/3/0/7/130775440/jobowe-zopez-vivasoba.pdfIn PDF document text
    • http://sejixuwitu.22web.org/30401174927.pdfIn PDF document text
    • http://izzzaaa.space/rexekk0ak2.pdfIn PDF document text
    • http://life50it.pro/9856451845598u3w.pdfIn PDF document text
    • https://mudabomem.weebly.com/uploads/1/3/0/9/130969182/4c38b15fbce1a.pdfIn PDF document text
    • http://table-wait.com/fasesinowewiriwagg96s4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485450/normal_5ffc78f859da4.pdfIn PDF document text
    • http://mebelrostov.ru/mufifafilolosifazikulojusxsid8.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/491920.pdfIn PDF document text
    • https://roviselazadavuw.weebly.com/uploads/1/3/4/0/134040559/kubufaki_jotowafimonajum_xifuxijifa.pdfIn PDF document text
    • http://cherrypimp.online/worm._io_crazy_gamesqar2x.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/temujonuwu/ammoniac_formule_semi_dveloppe.pdfIn PDF document text
    • http://fezifax.rf.gd/vuzelet.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/aieee_full_form_2018.pdfIn PDF document text
    • http://gositagopa.rf.gd/android_phones_with_removable_battery_in_nigeria.pdfIn PDF document text
    • http://jogekofasi.rf.gd/tetolumibo.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_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 5324 bytes
SHA-256: d530ff7047555cf23a49042e1817b3291c057ef82728cab6fc47459534189424
font_01_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 11588 bytes
SHA-256: 08c8625297ac54175d37377168fd0c8847324b2bfa9a290d82a1dd72b5a631f7

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