Malicious PDF — malware analysis report

Static analysis result for SHA-256 383b7b3540b1773b…

MALICIOUS

PDF

86.4 KB Created: 2021-04-01 20:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 739c01eebc5c3494a6cadeda987d9b10 SHA-1: 371fb8b4165a192b0b125fb65fd217758ab7cc72 SHA-256: 383b7b3540b1773b042c199dc083950d452fd8665c0c1962c83b92a2a9b680ed
162 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, containing numerous embedded URLs designed to lure users. The presence of urgency and download button lures further supports a phishing or scam pretext, likely directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=pride+go-go+elite+traveler+4+wheel+scooter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459914/normal_604e90f69004d.pdfIn PDF document text
    • http://renuvev.iblogger.org/zazirirawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499629/normal_5ff29d09eea9e.pdfIn PDF document text
    • https://madisilusira.weebly.com/uploads/1/3/4/3/134321428/e4702132d1b2dbf.pdfIn PDF document text
    • http://naturmilans.fun/guwuxulalozezubcnyxd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_5fe43cde0e92c.pdfIn PDF document text
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/rimexeliniwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5fc8b0bedb6af.pdfIn PDF document text
    • http://mosasekoz.22web.org/united_airlines_logo.pdfIn PDF document text
    • http://opt05.ru/briggs_and_stratton_yard_machine_550ex_manualwrzc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_60444049bff70.pdfIn PDF document text
    • http://pumuwofonukel.22web.org/22016943047.pdfIn PDF document text
    • http://axacheat4.xyz/tologoforawinelimamncaxd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_5fd12a85bd367.pdfIn PDF document text
    • http://satejenojosi.iblogger.org/maferoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_d58d3cc57c7c4d2ea99a829e3361ff3f.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_f38758c38c7e4ba1a88541e0717631b1.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_b425b62060054922b6424c18cb53f7b8.pdf?index=trueIn PDF document text
    • http://rogidisili.rf.gd/3718509316.pdfIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_efba0aaf6e3b46f09eaa51473b8fa9b6.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 5476 bytes
SHA-256: afad2f394a43291be1658ae2cb79eede4e8be1e43b2b120e9e4a18d57e32a755
font_01_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 11472 bytes
SHA-256: eaef9f6f9b7b7fdfdbb6600dd3782f2e60cece2c4c2b7640529177f8236bc402
font_02_sfnt_off000136ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CA 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd