Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f831a689545d9bc…

MALICIOUS

PDF

78.5 KB Created: 2021-05-24 09:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5f121e283372660fbb30ea88f51e900f SHA-1: 8e8543e33a4c6342edb5269ec4fde9cc1253857a SHA-256: 7f831a689545d9bcf2873036a731a070eda75718a71a648a6cfb5238e00c8063
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are SEO-optimized and lead to redirectors, such as 'https://zajinet.ru/strik?utm_term=how+to+open+a+vivitar+film+camera'. The document body, though heavily obfuscated, suggests a lure related to camera repair, likely intended to trick users into visiting malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=how+to+open+a+vivitar+film+camera PDF link annotation
    • https://dejuxowiku.weebly.com/uploads/1/3/0/7/130738850/25bbfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_606cb7a22702c.pdfIn PDF document text
    • https://tasitovutad.weebly.com/uploads/1/3/0/9/130969559/255bc2f0682cf.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/68022679fa4d30.pdfIn PDF document text
    • https://kebolegenadudus.weebly.com/uploads/1/3/1/4/131454121/zabeborusofebeb.pdfIn PDF document text
    • https://zisamezasebav.weebly.com/uploads/1/3/3/9/133997726/galokedeli-vafokodotina-juxeribiliguto-majuja.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/rerine_dimagogomuxuw.pdfIn PDF document text
    • https://sotogirepatobob.weebly.com/uploads/1/3/1/4/131453915/2100672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_606e0eced31d7.pdfIn PDF document text
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/rubib.pdfIn PDF document text
    • https://tujelogujonugi.weebly.com/uploads/1/3/4/4/134491942/pusabubu.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/1297368.pdfIn PDF document text
    • https://wurokilusonopos.weebly.com/uploads/1/3/5/3/135345649/3574720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_5fd164ca38f7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kujesulad/72049385250.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/gupunul.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/razesupabesiwuvut.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/what_does_a_flashing_red_light_mean_on_a_battery_tender.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/linking_cubes_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/how_to_fix_an_edenpure_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/wupobu.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/admin_manager_resume_format_india.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 4884 bytes
SHA-256: 4f859660b80aaf702ca789389c425139323ae3adfe489f57fd6de43c5cbe08dc
font_01_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 11100 bytes
SHA-256: 5063cb3098ef83c44b4d2e79155d9c3784f918339f360ae9fbe62231a17149b9
font_02_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2