Malicious PDF — malware analysis report

Static analysis result for SHA-256 779aaa38e02bcc7f…

MALICIOUS

PDF

78.6 KB Created: 2021-02-28 10:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0b4acca656aa629abbd1bc347214caec SHA-1: 7da0020d407debe2617f725e3958a1c1899b5b10 SHA-256: 779aaa38e02bcc7fa42f1b8e9b01431d16dd18830b9b3b822357a424a36b9156
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to a disposable hosting domain, suggesting a link farm used for distributing malicious content or phishing. The document body, though heavily obfuscated, contains text related to a 'potscrubber dishwasher repair manual', indicating a lure to entice users to click on the embedded malicious links.

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://vilenefex.ru/123?utm_term=ge+potscrubber+dishwasher+repair+manual PDF link annotation
    • http://zipogagu.iblogger.org/spanish_to_english_translation_free_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_6027da6fbe4ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6011b594c97d0.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/iKsSNji/suwokujipuwipowexixewep.pdfIn PDF document text
    • https://cdn.sqhk.co/merodobiweve/6iihihd/zadotus.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/7hRjgig/laberemivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5ffbba8302ec7.pdfIn PDF document text
    • http://wezoweno.22web.org/suxejubudexudoditomozaki.pdfIn PDF document text
    • https://cdn.sqhk.co/mixirulizab/Jziegfi/luwanovubisamarime.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/Zhexkjf/badlands_winch_review.pdfIn PDF document text
    • http://dkmz3.club/mifurubafonelazigitexafusxpyb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanesipub.rf.gd/adventure_park_long_island_waiver_form.pdfIn PDF document text
    • http://kamabutexukawiv.rf.gd/5_paragraph_essay_template_for_high_school.pdfIn PDF document text
    • http://bijasubibivov.rf.gd/65994779299.pdfIn PDF document text
    • http://zoxalojidud.epizy.com/authority_and_american_usage_analysis.pdfIn PDF document text
    • http://koxowasone.epizy.com/kevagipefikokaka.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_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 5576 bytes
SHA-256: 789cb6e31bfa2b85280ebf1d1fc6573d63d74bc22a463a90e10adccbc7aa867f
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 10408 bytes
SHA-256: 2b6fd4152f09c673b32c469f87e4b5026353ba70d66466970dbc923dba742fd6

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