Malicious PDF — malware analysis report

Static analysis result for SHA-256 a492e1bebfd95804…

MALICIOUS

PDF

71.2 KB Created: 2021-04-10 12:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cf5395610c70804c47dc0c46949929a SHA-1: bf1d076b737f9f563a872ce9460614fa3685dda4 SHA-256: a492e1bebfd95804b9da1262cf120d568f82c49045b9224bde8bbade2f7c23d3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various platforms. This behavior is indicative of a link farm or a phishing lure, disguised as a fridge manual. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=fisher+paykel+n395b+fridge+manual
    • https://zumekaxiligub.weebly.com/uploads/1/3/5/3/135385258/jivuvokiwufozono.pdf
    • https://cdn.sqhk.co/duwenaxiseve/fhgibge/4_pic_1_word_game_download.pdf
    • https://cdn-cms.f-static.net/uploads/4374376/normal_602421807575f.pdf
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/xuwoluvi_jodewigu_keniwebek.pdf
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/6974233.pdf
    • http://okstore.info/83510907463bfu4j.pdf
    • https://cdn.sqhk.co/tinolefowi/qYiihgN/jovevobonawidiraloroguw.pdf
    • https://cdn.sqhk.co/vumuwilaj/8qzidSc/erdas_imagine_2015_tour_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4502906/normal_5fe5d04d20ff1.pdf
    • http://form-lnstagramcopyrightservice.com/54075640550we4pa.pdf
    • https://cdn-cms.f-static.net/uploads/4473903/normal_6058244e0dc60.pdf
    • https://cdn-cms.f-static.net/uploads/4484993/normal_5fdbca57f0f83.pdf
    • http://edalovert.xyz/36671554297r14we.pdf
    • https://cdn.sqhk.co/gobajejuz/fXREIcV/riposte_fencing_definition.pdf
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/xokuzow.pdf
    • https://buwavazazaradig.weebly.com/uploads/1/3/3/9/133999961/zevarimapo_fowezivitev_subusufipi_labilamegipa.pdf
    • https://cdn.sqhk.co/vasegodesazu/OTumibw/5441284462.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6ad924fe-fca3-492d-a8a7-d9718cf3a281/playstation_network_sign_in_failed_ce-33992-6.pdf
    • https://uploads.strikinglycdn.com/files/b4bfad81-f4b2-4887-ade8-bee8f5a2c557/betitamamukavakubud.pdf
    • https://uploads.strikinglycdn.com/files/caf241e3-f95d-4d1c-96d7-5f8b72559f0d/39177472038.pdf
    • https://uploads.strikinglycdn.com/files/e251ddb6-040b-4019-a306-a1ce31b0e275/korean_alphabet_chart_with_sinhala_translation.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_off0000d696.bin
edb92b9faceb0649561be6c6c88fe393df0d93ce255e67e7a669e6d1f2aba8c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 6160 bytes
font_01_sfnt_off0000eb62.bin
cf957ba0b8ce817382bed21fd375cf687a9c81cf7b800c09db1f8bb964c66eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 10520 bytes

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