Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e83b2f60834c81…

MALICIOUS

PDF

83.3 KB Created: 2021-04-11 23:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e7e27371a585b4abd25da524b3ee0db1 SHA-1: c5c8ff1f11012cf974b883958681e85c9e59c4d6 SHA-256: c4e83b2f60834c8134f13c79da1f417c9f9054c9623ce6e4ffd6e9e1c43f1e7c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=active+listening+books+pdf PDF link annotation
    • https://cdn.sqhk.co/jakabapewuv/iiQmRja/48035812736.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/d0NIphe/didezopiwepeforomufimim.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/iayRJib/perajowinezotetaxemoj.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/X8cjfhd/gravity_rush_2_ps4_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/jeGhdgg/70854123585.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/fQqE1hb/77234294750.pdfIn PDF document text
    • https://xorodipilubila.weebly.com/uploads/1/3/5/3/135311864/c7b50bb96.pdfIn PDF document text
    • https://pafirovax.weebly.com/uploads/1/3/4/6/134662293/kikaxisud_jutetusoximeku_jumezen.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/0ghKeoT/video_gif_memes.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/xejilemibizofuk.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/duzexefemosaxe/36224632312.pdfIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_3e6e5a7e63fa4c7d8d92777a7a942180.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/what_does_a_house_fire_mean_in_dreams.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/restaurant_management_interview_questions_and_answers.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_daf6a075115f47d7bf6f6206ec45755f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/great_answers_to_behavioral_based_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba3fe6a-ad5f-439b-84fd-115ec66470cf/tonewogipewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85c47c0-b419-4169-9b74-fcca189fa719/wewijegufunopozenixe.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_fbb6c24303bc409a9e3f298ca3feb93e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0ec8e4-d604-463e-a6a2-4dfe3567e9e6/how_many_amps_does_a_dometic_13500_btu_air_conditioner.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_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 5272 bytes
SHA-256: c7b6f6c1218ea67f869518d0108b43c9aa9a681e2a32d3557297e8164a5a31b6
font_01_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 11136 bytes
SHA-256: 73e044315d18420f42c083a228436009dee53130693e93f94941fbaa374d1085

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