Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1db74905751fd4…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 06:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c56892fdd6e9ba0926e4701fce26194c SHA-1: d8a3cec82eed5be05ca2a13994c31a267102fdb2 SHA-256: 3f1db74905751fd40f3faabec3a93eb27818e3ccf93dc8eab71f07ae3e30883d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm for search engine manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=mcsa+windows+server+2016+r2+complete+study+guide+pdf
    • http://card2card.live/970805452000zykm.pdf
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/8506653.pdf
    • https://cdn.sqhk.co/nefakovuwot/idhOhbt/18131835160.pdf
    • https://cdn.sqhk.co/xolokenuw/JVfhj3N/waneveret.pdf
    • https://dubasebajulux.weebly.com/uploads/1/3/1/3/131382081/pafikuvon_penegimolew_seruvemiboko_xawutowixisazu.pdf
    • https://vipoferizapil.weebly.com/uploads/1/3/5/3/135346342/puxew.pdf
    • https://cdn.sqhk.co/sudidoxa/hbfOicj/92393236129.pdf
    • http://899themes-demo.ru/62399102660tdg2m.pdf
    • https://cdn.sqhk.co/bomunerafoju/hb2gial/xewixana.pdf
    • https://cdn.sqhk.co/relulapezele/YFhi4ig/89300042596.pdf
    • http://unosital.space/42240165903mrtgd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/puretulenuza/fijanugefupobopefavamifi.pdf
    • https://s3.amazonaws.com/vonutavekip/gomame.pdf
    • https://s3.amazonaws.com/moduxanakuri/97555474840.pdf
    • https://s3.amazonaws.com/nalifij/braun_strowman_theme_song_2019.pdf
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_3de1b2792ede4f32a11bddefa15c42ad.pdf?index=true
    • https://s3.amazonaws.com/xarojapi/63314690281.pdf
    • https://s3.amazonaws.com/xarojapi/weather_report_hafizabad_7_days.pdf
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_5e39bc69897f48a5ae43bb3997e306a4.pdf?index=true
    • 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_off0000efae.bin
c7e1b412dce1a3a8b4f1fbf7cc1a2f75f6b26eb8fd3c6ec5a83f9af18e6389e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 6212 bytes
font_01_sfnt_off000104ee.bin
359dd33ca571f44a7edf0ef70771dba17a4e282ea2316832774276f6fa2f511d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 10648 bytes

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