Malicious PDF — malware analysis report

Static analysis result for SHA-256 279dc8231022adde…

MALICIOUS

PDF

76.6 KB Created: 2021-02-24 04:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 24836fb96783eea950cdf0b11a0a950d SHA-1: a0c66070d189fa697c2a98a7734d09f833383e56 SHA-256: 279dc8231022addecbc99a859a444e04f6b654c5116498047ce67645109d8ebb
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or SEO abuse for traffic redirection. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts users to call a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of external links and the heuristic firings strongly suggest a malicious intent to redirect users or engage them in a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://leonvi.ru/wb?keyword=let PDF link annotation
    • https://napopetonepew.weebly.com/uploads/1/3/1/1/131164038/dawutezu_vedonepateve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_5fd10177225e7.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/ba92396c981972.pdfIn PDF document text
    • http://sefajoga.iblogger.org/12662374404.pdfIn PDF document text
    • http://copyright-infringement.business/wedupuvarxtli.pdfIn PDF document text
    • http://mikrotikwizard.com/the_essence_of_anthropology_4th_edition_free_downloadkxdne.pdfIn PDF document text
    • http://woxupepij.iblogger.org/fevudemozikapekemeke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokejavopif.rf.gd/squeeze_theorem.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/roxesi.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/zuwok.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/5986551813.pdfIn PDF document text
    • http://fulawumobolofog.epizy.com/melody_songs_dance_performance_in_telugu.pdfIn PDF document text
    • http://papelevinijefab.rf.gd/96853151783.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/rosujabaxitagirumazom.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/disciplinary_hearing_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/86866505776.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_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 5408 bytes
SHA-256: 1dc5bf1187ac155c11a72f4470c908a4903de5ea5245ecbe60d3b62d95b685c7
font_01_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 10388 bytes
SHA-256: cab804853676a49f902f7c2995a652df5b97851e87e3f664bc24c1927af08b2f

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