Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b01cd59a0837c8…

MALICIOUS

PDF

106.6 KB Created: 2021-03-22 07:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 50322c856c5751fbbe2b1148765cb6d3 SHA-1: 1d6205edf2bfd7e91bd67550386ced652d724118 SHA-256: e6b01cd59a0837c89671484c3e9bdee3994c64bf006ce5011f50b8348cbb71ba
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to 'Galaxy note 4 user guide' and 'wkhtmltopdf', suggesting a lure. Numerous external URIs were extracted, pointing to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=galaxy+note+4+user+guide PDF link annotation
    • https://cdn.sqhk.co/sejaganetaxa/hfkjfja/52436627577.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/87582149811o1f3d.pdfIn PDF document text
    • http://smcjd.com/free_introduction_to_algebra_worksheets0wh7h.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/E4GPShi/rurepubibi.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/alg_ii_anlage_vm.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/the_boy_in_the_striped_pyjamas_movie.pdfIn PDF document text
    • http://topplafond.xyz/22195980477jd02v.pdfIn PDF document text
    • https://cdn.sqhk.co/vigamodijek/gjfq9ja/42481706108.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/83412398728.pdfIn PDF document text
    • http://skidki-day.store/how_to_reset_triple_diamond_slot_machinekjr18.pdfIn PDF document text
    • http://kamini33.ru/c_mvc_interview_questions_for_2_years_experience6blf7.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/mibokamikonatonixon.pdfIn PDF document text
    • http://xtreme-sport.ru/mexelusovidotavat39kun.pdfIn PDF document text
    • http://ulekschool.online/titabakurijaxsfo9.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/ifapAuP/40715399226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumosaneja.onlinewebshop.net/m113_apc_in_vietnam_in_action.pdfIn PDF document text
    • http://vosakazabed.rf.gd/mubugetinilofa.pdfIn PDF document text
    • http://rilulavonepuv.epizy.com/calendrio_vacinal_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5A 3724 bytes
SHA-256: b64350c7bbdab9a8dc064f21a0594747627629593141b2bb6cd02da97e11ebda
font_01_sfnt_off00015a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A98 5280 bytes
SHA-256: e0467f538429832f7a7ba6781017b85287ac336fd04f2c56b4c633e19a2da1ae
font_02_sfnt_off00016cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB2 14616 bytes
SHA-256: 224cbdc2a734307b1417fe35bf0fc59e6f5046c743fea72237da9a91a989751e

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