Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d885096a7933af…

MALICIOUS

PDF

82.1 KB Created: 2021-01-30 17:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 79eedaf69d2ae3fefe8476ee64af8c73 SHA-1: df6f53daef95fec9b643b58bd5d81dc238a0388d SHA-256: 82d885096a7933afd0dc98d3da7c202bab8f150ebab20e4d5b42d1bbfe920128
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious link farm, likely intended to lead users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=what+does+a+sheep+say PDF link annotation
    • https://cdn.sqhk.co/livatunozasu/sBJMhax/62942737592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc985ffce4f3.pdfIn PDF document text
    • http://changepass.online/doomsday_clock_timelinegfgky.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/2cbc7a3b993197.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/mutokulodawora.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/Z71Eajf/92037837809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454164/normal_6010cc5a879b2.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/YlSS5jh/flat_pack_desk_design.pdfIn PDF document text
    • http://lightly.store/3670999046103toh.pdfIn PDF document text
    • https://milevewon.weebly.com/uploads/1/3/4/0/134041257/ximexoxiwuzek.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/3160949.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/dumupimirawawesozo.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/3409633.pdfIn PDF document text
    • http://submonster.xyz/certificate_border_vertical_vector_freedn7bh.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/lozutaxa.pdfIn PDF document text
    • https://nukafubesogu.weebly.com/uploads/1/3/4/4/134463640/d91bffae09b.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/kIWihws/67330402616.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5fee105d0280c.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/2114475.pdfIn PDF document text
    • http://4gusevshop.space/poblano_pepper_recipes_soupcz5o5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 5036 bytes
SHA-256: 191657b18176a17bafd9ae512e1c5aa9be76ce94f1aede9487525a2ab7c81e1a
font_01_sfnt_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 10604 bytes
SHA-256: 04d94df4a7598dd33650dd42ccacda9fb3681d63529dc627012edeecd5e92831

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