Malicious PDF — malware analysis report

Static analysis result for SHA-256 108d1b4836a6be64…

MALICIOUS

PDF

79.1 KB Created: 2021-03-30 09:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2c57299f9662040fd66770b19adbf55d SHA-1: d54a6485c60929c452c627172bc9e42b64b193f7 SHA-256: 108d1b4836a6be64972fa58b656ebf1835784f2ae08b59f9f6b320b876de4563
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external links, with the primary one being a lure for 'calculus a complete course 9th edition solutions pdf'. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=calculus+a+complete+course+9th+edition+solutions+pdf PDF link annotation
    • https://cdn.sqhk.co/rubovadu/qgcjdie/semitic_religion_meaning_in_urdu.pdfIn PDF document text
    • http://lakcherie.ru/wirobuxirotosoxizitaruba41.pdfIn PDF document text
    • https://negowisavu.weebly.com/uploads/1/3/1/4/131406226/nexajamug_tezeruvu_sumixubaxakuw.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/jhiaggM/60295342496.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/igggfoF/66930149482.pdfIn PDF document text
    • https://tokarakuwo.weebly.com/uploads/1/3/0/9/130969339/repamunutiba.pdfIn PDF document text
    • http://smm-target.ru/monobamutua33rr.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/dhjgiib/cosmos_possible_worlds_new_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/4ZVgjjh/69344086077.pdfIn PDF document text
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/bilewela.pdfIn PDF document text
    • https://tojalalegeb.weebly.com/uploads/1/3/4/5/134584715/sonifosafik_tafogutofawega.pdfIn PDF document text
    • http://artemk.ru/526606959391zezg.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/gofilafixu/wodutibukowelufarefif.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_56455655f36b405d93d77a5bcd159ffa.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_175f0bcfd42340a7af2e635463df6394.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/messenger_android_4._2._2.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/classic_wow_warlock_questing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/71817825316.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/rorifuwejalofelax.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/ge_dryer_parts_near_me.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_f68c9c11bc934d60b3ca5b31d7b4c9e6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 5456 bytes
SHA-256: 6247c84cb0412a868cdfd013636945a5c3ef002cbaf186fbfbe444373b4c3c6d
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 11104 bytes
SHA-256: e7fa4864dfb5c5d1334305d8ecf978fbb1a9aecf9049a77db46322faf2dd3d6c

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