Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afcad12b8d1083d…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 13:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 42b293b9e3792c3b059951f2d910a2d3 SHA-1: 43a5f3068a2523520c699eeffda88a8b33b9393a SHA-256: 7afcad12b8d1083d0eb45b42ff0ec87683695ef815a7b4ace889664a62d37108
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating a link farm and multiple embedded URLs, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external links points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=who+died+from+little+house+on+the+prairie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402948/normal_5fe88df4f203d.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/uxkjhih/play_store_app_install_download_free_mp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_60369be02c9b3.pdfIn PDF document text
    • https://tajupifode.weebly.com/uploads/1/3/1/0/131070450/fevogowesu-vokaremuze-sedirudotesixab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_600f5dc39d8e3.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/gjiiiif/vr_horror_maze_scary_zombie_survival_games_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5fd7eb345217e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fed1584a6fdd.pdfIn PDF document text
    • https://kujopupij.weebly.com/uploads/1/3/0/7/130740053/d753557b5.pdfIn PDF document text
    • https://gagoxesuv.weebly.com/uploads/1/3/2/6/132681450/4198433.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/Ojhbb6C/1345965426.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/ryobi_leaf_blower_carb_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/sikudile/dgckqCo/the_first_ice_hockey_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/gfpie9z/beriwilopi.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
    • 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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5176 bytes
SHA-256: ffcf797d488ca1945ca486dfc683a24886ae0953466b6e4eb046e4c439347563
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10184 bytes
SHA-256: 863ada595e14ebb41ac692ea00339e308b2c735ce8158c95779323638f6689ef
font_02_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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