Malicious PDF — malware analysis report

Static analysis result for SHA-256 956b1a285f8be94d…

MALICIOUS

PDF

77.6 KB Created: 2021-03-27 11:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3f83a8d1a82a70e5a7fad38d0bbef756 SHA-1: 87ed90f2d34a4395064aacb6fc383590ed38d7e7 SHA-256: 956b1a285f8be94d56ed2a7599b0f5d49a32635a9835f7d1c1f885f1b10ea094
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=accu+chek+smartview+test+strips+coupon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fe7cc283a788.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/latejupononi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417531/normal_5ff27d3136667.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/gibgelk/lasigevunudebixu.pdfIn PDF document text
    • https://jelaxatibepa.weebly.com/uploads/1/3/2/6/132681396/togaza_semewazowuli_literoxolasusis.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/VRPCgwl/photo_editor_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zimogemage/hbmhfLw/wedubogunabezaj.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/modojixarerisu.pdfIn PDF document text
    • http://wuvijenebomukib.iblogger.org/sinopsis_de_auditoria_administrativa_joaquin_rodriguez_valencia_gratis.pdfIn PDF document text
    • http://wovobogawukepu.iblogger.org/answers_for_math_makes_sense_6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5fe38c4a21fae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_60143d025681c.pdfIn PDF document text
    • https://cdn.sqhk.co/nokowifupe/8gga4jg/bitcoin_pop_earn_real_bitcoin_apk.pdfIn PDF document text
    • https://guxodobozit.weebly.com/uploads/1/3/4/3/134333536/f709b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_b27af3e32cee419d8a81870711dd4cda.pdf?index=trueIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_668aaf5542e84df58f56ae7e8d2f43dd.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_6e65fb09b3fe4e6cbc13c322d4d0fe91.pdf?index=trueIn 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_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 5348 bytes
SHA-256: 6198ca33facd5a45b119cc74f81ecaa7f03c2d7a93c07f44e57575757f2cc69f
font_01_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 11328 bytes
SHA-256: deca55e75d2d23b266b5433c375da6d19aabca0168a94f5d377ff7b4ca357a4e

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