Malicious PDF — malware analysis report

Static analysis result for SHA-256 7828e5efab6c8434…

MALICIOUS

PDF

79.5 KB Created: 2021-03-01 06:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aa4d305ed154e2538d91b3d245055acb SHA-1: 98a56eaee9f1cc47648187ff9d312c4496a20fe6 SHA-256: 7828e5efab6c84349a1e95816d78cbe7a39ba74981067c036041e195ed9642d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, 'https://lozipotod.ru/123?utm_term=is+red+heart+yarn+made+in+china', is flagged as unknown reputation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure points to a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://lozipotod.ru/123?utm_term=is+red+heart+yarn+made+in+china PDF link annotation
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/deburegajawajuwejud.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/daddys_little_girl_poems_death.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_6024cc04c9e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_5fd68b5c88f6a.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/kafitexuk-garisoweluloru-dopugigusito.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/AgjihgN/war_alliance_realtime_multiplayer_war_games.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/tivo_slide_pro_remote_manual.pdfIn PDF document text
    • http://nakozek.mypressonline.com/sims_3_64_bit_mac_expansion_packs.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/netgear_ex3700_setup_without_wps.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/fgeeibc/aaron_rodgers_salary_2010.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/bagarudarerukuzof.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/Whahjgf/animal_radiology_technician.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/petikamov/best_universities_in_the_world_for_masters_in_business_analytics.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/73605649651.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/37909514124.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/zajulebavisufimuranis.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/6419111636.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_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 4864 bytes
SHA-256: 63d5f5e16805915fa6458ce42d7edab4211ddfc33cda6e38b4c91c20d84f0eee
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 11152 bytes
SHA-256: 752c04f89a5e6baa47240c409e1a763c78673f712f7e8d0f26aece9a8f26278d
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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