Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d730aa81259579…

MALICIOUS

PDF

70.1 KB Created: 2021-04-02 23:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cbd31dbc77eb515dc6cdc51f1c02ad9e SHA-1: 8e6a33f6e8750ebbf25e4b6861e5f686b0f3aa5b SHA-256: d6d730aa81259579fc4db6b81352699f26844a6e18e68f6979aaa8b3c5469cb0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'lyrics pdf'. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=helplessly+hoping+lyrics+pdf PDF link annotation
    • http://fimunukowira.iblogger.org/40334941289.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/how_to_program_a_programmable_logic_controllerdjpr4.pdfIn PDF document text
    • http://qwertyujg.xyz/15531008795q6ldb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_6020d1c199b06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5fdc1b1a5ecaa.pdfIn PDF document text
    • http://trokot-newshop.online/libalusjj6w6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5fd76bdad4029.pdfIn PDF document text
    • http://italy50wow.pro/kigixifobadirokabimo2k3hb.pdfIn PDF document text
    • http://salonvarna.com/pelowusibu2cbx0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_600fcf0a64c16.pdfIn PDF document text
    • http://sluzhba1.net/best_skills_horizon_zero_dawnlh5o2.pdfIn PDF document text
    • http://harkateine.fun/wonaluxakiwojinoxeragunuplm4qu.pdfIn PDF document text
    • http://cocobuka3.xyz/48834597831p079a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_60640c615b7d4.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/gazijewevan/vidonovadizak.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/decimal_worksheets_for_5th_grade.pdfIn PDF document text
    • http://beturibux.rf.gd/lejigixifase.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/sarinekifumawotok.pdfIn PDF document text
    • http://ruzupaxenerod.epizy.com/fire_truck_toddler_bed_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/venanup.pdfIn PDF document text
    • http://zifisag.epizy.com/meter_to_feet_conversion_chart.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 5272 bytes
SHA-256: 8519500ea1d4816791d25d51d80a88cc4d9a71921ffdf6447bdc8889c7669526
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10760 bytes
SHA-256: e8a050e60889ec353f510515e4e220e3ad66d434b1729a021244b03a3d26cccf

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