Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc16635fb695793…

MALICIOUS

PDF

84.7 KB Created: 2021-03-31 01:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 78babca1d64d4ac41c81246030424635 SHA-1: fac54c49722b88d694b28366c156109d97800b7a SHA-256: 8dc16635fb695793c8ea0101f6b304fa603ef6752bc07d6a63a239a8526a7ef1
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into clicking links, likely for malicious purposes. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wix?keyword=is+749+credit+score+bad PDF link annotation
    • http://vnds-v.website/426211095416vqfa.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/hihGIhj/fr_legends_decal_code.pdfIn PDF document text
    • http://excschool.ru/47849234196iorlt.pdfIn PDF document text
    • http://politach.com/jaws_2_bookxijos.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokiwil/f7hdjiP/kataxirotojerobi.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/8Pjjgfj/the_burger_shoppe_wake_forest.pdfIn PDF document text
    • http://my-favshop.online/momo_michael_ende_quotes7jdsb.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/ijDhghq/xaduji.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/Fhe3zDE/prepper_supplies_at_costco.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/kijjahg/997170448.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/sgCiehg/ice_cream_roll_machine_price_in_philippines.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/ace968e7-139a-4a1c-8288-040a296f53c6/80368436497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e704be86-7fb6-4a68-96cb-38ae94361bd0/biwud.pdfIn PDF document text
    • https://4fd7ac12-06e8-439c-96a9-7636004ccb32.filesusr.com/ugd/9554ab_5b44dc0ac0804c4db9cb581473696fe2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89fe0b16-626e-4686-b35f-a5c0944b3cb2/11217244059.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_0267a99baf2947a286c1791208903b4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21dc10ef-5f9d-42de-807c-d7f89779ee71/fegetovewakodabokuxidij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87eecfce-164c-4638-be1b-aa3c003eb844/20378561135.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_3b69bb7c94644b359fe6dbfa41bb8d96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b3d007-1540-4881-bf18-5dcd0ee83d11/95461455042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e15bb88-eb70-408b-955c-5f6c11379ccd/28820504382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbaf777-4bb9-4b95-a7b2-15e059efed01/80305643367.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_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 2856 bytes
SHA-256: 30505cf77ba8a3f6a71ba56c2bc124282218affb14726b01dc63d1ce4df229fd
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 5300 bytes
SHA-256: ee576b9841ecf8133a4130a9493217c77581c6ff535eca45cb192e01ee213ae8
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 11040 bytes
SHA-256: 4d793f785e8dd391d1c9290c3c18ff456a847652d430031f74678859f22aff64

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