Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5914bb46796aec…

MALICIOUS

PDF

77.1 KB Created: 2021-04-07 01:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 29c5ac13b833fafc4c501aed3110974e SHA-1: 95e89cc699b4a6c3f7d4fdedaeb34058832f3e57 SHA-256: dd5914bb46796aec82346d77ac800b60b0903adc09b2a651d72377d74fadbd75
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://leonvi.ru/award?keyword=crash+course+in+accounting+and+financial+statement+analysis+pdf PDF link annotation
    • https://cdn.sqhk.co/palugalanivo/die4hiG/legend_animate_text_in_video_latest_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zobunifi/hc8xwja/50129358146.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/what_are_the_three_levels_of_reiki.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/1hhW5G0/31905085273.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/hcbT4gh/bath_bomb_packaging_template.pdfIn PDF document text
    • https://cdn.sqhk.co/tixelila/cjbigls/paint_color_by_number_mod_apk.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/7fdcbe64f869a1c.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/3191784179.pdfIn PDF document text
    • http://dumigegin.medianewsonline.com/bemorifebewinexis.pdfIn PDF document text
    • http://lalikexitaxixix.getenjoyment.net/4759052554.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/f5f0b4a54ef3f23.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/tujugovejotowofixamigoj.pdfIn PDF document text
    • https://soranetibipuve.weebly.com/uploads/1/3/0/7/130738631/jotovelumovuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/joterige/17993867110.pdfIn PDF document text
    • http://lebusepuwiri.atwebpages.com/terowuserakebuzex.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/burger_king_app_deals_uk.pdfIn PDF document text
    • http://wusuposakatoxel.myartsonline.com/zofobalopidipuzosafod.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/kawozexiwoxanuxabigemasul.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_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 5576 bytes
SHA-256: d658cbde8ad03a0bd32fbfa99480864689fc3e72670d179f32b73ef997016ffc
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 10752 bytes
SHA-256: 6b01914b8887fe351f137c3e113ed1818c0883f00417f30aeb8532a31ff3610b

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