Malicious PDF — malware analysis report

Static analysis result for SHA-256 f770a42a440108a5…

MALICIOUS

PDF

93.6 KB Created: 2021-03-25 12:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8be0e59d26a65e79ca45f1c7bd6c1b72 SHA-1: a7ed5fec0d988d4f1f7ca93f060f8978958d70e9 SHA-256: f770a42a440108a57efb88660db25c5cb9befb6922a18abf0343eab2a8c1b5b7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing or malware distribution technique.

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://soxebez.ru/wix?keyword=acer+aspire+one+d257+service+manual+pdf PDF link annotation
    • http://tevituvodejifep.mywebcommunity.org/89309966494.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/fawajazitowokogenuta.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/5956274.pdfIn PDF document text
    • http://topplafond.xyz/zig_ziglar_power_of_self_talkhz0lg.pdfIn PDF document text
    • http://igcopyrightclient.com/chemistry_lab_safety_quiz_answers7v1p2.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/KwhhRhe/cleaner_for_whatsapp_pro_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/ErjdjfO/gedigatexetid.pdfIn PDF document text
    • http://tersq.space/best_way_to_invest_in_real_estate_2020dz446.pdfIn PDF document text
    • https://jetakazam.weebly.com/uploads/1/3/2/8/132814031/nabitubajosuniw-kigikipele.pdfIn PDF document text
    • http://sportplays.ru/50055127307s48mm.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/the_stranger_albert_camus_free.pdfIn PDF document text
    • http://depusapo.mypressonline.com/avian_diseases_manual.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/0ce14a10e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jowawaba.atwebpages.com/night_mother_skyrim_quests.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/88687734815.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/bissell_proheat_plus_upright_carpet_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/12767384552.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/pdf_french_for_dummies.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_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 5488 bytes
SHA-256: 12647d4e0222d4c4ffa51f38646b53d0e50938702758d0db7a67634c4d364908
font_01_sfnt_off0001330f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330F 11000 bytes
SHA-256: 319800a45d7a7d15978bdf592974f4402dda270d9d8a2ef444e2c7964d7d3351
font_02_sfnt_off000158b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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