Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c2b081a4862a4e…

MALICIOUS

PDF

86.0 KB Created: 2021-04-29 04:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a9272c96bf0ea6e071c95c60861f265 SHA-1: c494de75f2cec5e870ed7af91d3523c7f2ea5bb9 SHA-256: f7c2b081a4862a4ee8714ea88beefe2746ebe04847318c4b21bac5c0d6e0717f
186 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 pointing to disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=short+stories+for+middle+school+online PDF link annotation
    • https://punekoba.weebly.com/uploads/1/3/4/6/134612552/fekofoxuvan_dokejav_tewamajezi_kawaxakanukuraj.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/cefOjiV/50090003481.pdfIn PDF document text
    • http://gloslides.com/is_bulletproof_diet_good_for_you3fjh7.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/zolajure.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/Xgh1Mah/face_masks_for_sale_made_in_usa_amazon.pdfIn PDF document text
    • https://rovijekamiveva.weebly.com/uploads/1/3/1/4/131437241/rurapulemadowox.pdfIn PDF document text
    • http://momentshop.website/81683742244e3ehz.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/6jfRP6g/crazy_cooking_star_chef_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/fubxgim/moon_patrol_rom_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/1hbCpje/agent_orange_weed_side_effects.pdfIn PDF document text
    • https://bamukozigo.weebly.com/uploads/1/3/1/4/131406799/8b7786af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e880e1c-e60b-425b-b69c-f96967f0e4e0/keroxokejuk.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_d8a0736254b847fc85552272d1fab688.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_7b08320adc724e1fbd9f2406b45a9b88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f70a629-f569-4cac-a620-dbcb821612e9/how_to_adjust_throttle_cable_on_polaris_snowmobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537fc1b5-0114-48a8-af8f-1774dc40686b/74543072072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ff8c68-9684-4ccf-a8a6-974cf46e33db/systemverilog_queue_find_last_index.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb37fa0c-7e64-430c-b949-3e7ca6a0dfcc/vapijetebigesereluli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb17052-4b4b-44bd-8872-8b0d95f90943/16351518416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7133416-333e-470f-9e94-09eebd9e602d/can_you_keep_a_secret_book_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5506c419-78ff-404c-88b9-c9f6ff331fa2/dungeons_and_dragons_dice_box_plans.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 5156 bytes
SHA-256: 7be6e771d7d4815c89a6bba6aa059cfabfe60542c622d2b373a650c61ce8be39
font_01_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 11004 bytes
SHA-256: 6d66d728de2898dbf1167aba4525e72b347cffc9dfc8c6dd0385ed6cb1883721