Malicious PDF — malware analysis report

Static analysis result for SHA-256 45910d13569b893a…

MALICIOUS

PDF

98.5 KB Created: 2021-02-05 13:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 93a9829bbc52b2bccc32f00dc93d1589 SHA-1: eb12edc3454f3b90593893345f5826fba2bf7fd4 SHA-256: 45910d13569b893aadf67f7f0001036f5b33f8d89821ec0465a2b91bdeddd7a0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM', suggesting an attempt to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and creation time. No scripts were extracted, but the presence of numerous external links points towards a redirection or download-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://jacksth.ru/123?utm_term=demon+of+lust PDF link annotation
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/mikukutibiwip-kolikemiroxijox-berilafadiful-zokepofe.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/giwurikitavu_gowelo_zumonekafepifi_jawas.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/023f6e3.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/YegiRWG/neon_chrome_ps4.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/2865617.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/naverot.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/pogonugagulafo-duwijekakebutos-bewosesedanoxul-dodudidim.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/BsIiigi/2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/ehfgcjg/51346076702.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/lemefofutomapox/13788689874.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/performance_appraisal_review_phrases_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/ligas.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/tunidotuzumabokoradirebo.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/63367937162.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/bhavani_mata_photos_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/video_er_for_pc_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/gangster_film_all_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/483493440.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 3056 bytes
SHA-256: e74534f7be8d3c9da9792427e40f6b4dfcbd383ef4df6e0169479933eb7191fe
font_01_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 4608 bytes
SHA-256: b156e74679c214370c52a2451d0348a37c0b925197d7dddb58f358729341afc7
font_02_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 18340 bytes
SHA-256: c8711b05f38f2e815315fd74e7c5879246d2292d9cad6265d734d65250d8c865
font_03_sfnt_off0001665e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665E 16392 bytes
SHA-256: 2c647d85d7954a53cda765a83de7a4d30e24f40a56ba1e2a355598f2255e71f1

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