Malicious PDF — malware analysis report

Static analysis result for SHA-256 41162e5cdb4d40d9…

MALICIOUS

PDF

67.3 KB Created: 2021-02-17 09:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fb578de4209e0501649574ea2261843a SHA-1: dc9c25823b319e5fe403138fd7cb063023207a6c SHA-256: 41162e5cdb4d40d98554e2ad3ca634bfadb9113e2334824d943b4b2bda9f33ae
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick users into calling a fraudulent support number. While no scripts were directly extracted, the presence of numerous external links, including one pointing to a potential callback lure URL, supports the phishing attack pattern. The file's structure and numerous external links also align with SEO link farm techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://druttle.ru/strik?utm_term=is+blackweb+good PDF link annotation
    • https://betetaguzom.weebly.com/uploads/1/3/2/3/132303315/11b9530ce8e4635.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/P0jaZeH/teduxodoworapavumavejugel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5fe3e5c6d4d3a.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jehdgge/fowekemigiwekikuzuxalupar.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/gepal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481828/normal_5fdf57d563b7e.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/iehibgj/88767582728.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/c7KFjea/fake_call_video_mermaid_games_online_free.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/takivudebak.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/zixomaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_6017cf5a2cc8f.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/Ygj3MOL/love_apple_taos.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/dazifozixawus/bodmas_worksheets_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/cissp_practice_exams_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/rilikigasirebekanejuveves.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/like_one_battery_terminal_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/65262709165.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_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 5244 bytes
SHA-256: 6469d687e26d58d649940fbbd89d77ec5a696d5d6653b2f2eeb8841458808ac3
font_01_sfnt_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 10336 bytes
SHA-256: f8c107d18772c25a14f56fd61b9fbe010c1f0768f7f2c2e41d1de983883e4f10

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