Malicious PDF — malware analysis report

Static analysis result for SHA-256 088c34e2a1ba44e7…

MALICIOUS

PDF

68.9 KB Created: 2021-03-27 16:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a7d5d7f0fcf0f1bceb49538f7206332 SHA-1: bca5bb810b9076e4a7098abe8615212a1e32d0e2 SHA-256: 088c34e2a1ba44e7ba3b5de212f90b663047f42bd9d2b180569293981ff52c85
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'pelibifir.ru', which is likely used for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'David birdsong photography' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=david+birdsong+photography
    • https://cdn.sqhk.co/temozelep/ik4JDVl/curious_case_of_benjamin_button_mp4.pdf
    • http://wufujapebapu.22web.org/pufolixelukimotexib.pdf
    • https://cdn.sqhk.co/zirigajer/l9UeWhf/wonufabusugaz.pdf
    • http://nowojikowelox.iblogger.org/simple_maths_puzzles_with_answers_for_class_2.pdf
    • https://cdn.sqhk.co/sixitigoxeto/Hjjiadh/history_of_science_in_medieval_times.pdf
    • https://cdn.sqhk.co/fuvopone/gdvjg56/jiwexo.pdf
    • https://cdn.sqhk.co/pabefidinaz/SidCFii/texas_campgrounds_jamaica_beach.pdf
    • http://wenaparufikunon.22web.org/64026534989.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/adfab206-38e2-4243-9f9a-66b99a5c85a8/galago.pdf
    • https://s3.amazonaws.com/sulasatevirexo/kaalai_vanakkam_free.pdf
    • https://uploads.strikinglycdn.com/files/90b15121-0503-4bdc-9b36-07abfce78da1/84166022606.pdf
    • http://sesaziroderud.epizy.com/oxford_word_skills_basic_student_s_pack.pdf
    • http://kobinegugagikag.epizy.com/5_3_1_boring_but_big.pdf
    • https://uploads.strikinglycdn.com/files/627c53b8-b71f-47b7-84f7-fbbbed80c6b0/what_dmv_is_open_on_saturday_in_columbia_sc.pdf
    • https://s3.amazonaws.com/wikurixobelu/podarogadudunozonaz.pdf
    • http://vatimofaxemog.rf.gd/real_estate_development_principles_and_process.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/esophageal_varices_treatment_guidelines.pdf
    • https://s3.amazonaws.com/legobegutulo/97791627926.pdf
    • https://uploads.strikinglycdn.com/files/d04e8e30-cda0-4d26-9694-f2482d6feb15/24684788177.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf73.bin
6abe2246567e21e4ba6d7aa2f3f822e85c248a807e7ae4fe4e3ff7f87c8ead5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 5492 bytes
font_01_sfnt_off0000e225.bin
f8f6806c4806fa66756c452ecf175e4d6b4f3975a030099ff99bf9e5d5a96c15
pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 10848 bytes