Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f4aa8e080c4090…

MALICIOUS

PDF

69.9 KB Created: 2021-03-14 02:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 016cc407a4b760f62ccf1d7cbecaa056 SHA-1: a228f7859341092b7c7020a3975e4dfd18009889 SHA-256: 69f4aa8e080c40901fe28b42b6fdcef5ef2d4fed39383ae43f07d2d2f4c238b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, with a significant number pointing to other PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/award?keyword=chinese+english+visual+dictionary+pdf PDF link annotation
    • http://watercart.ru/331431594857xml8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_60295e266db1f.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/4226247.pdfIn PDF document text
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/kikedejib.pdfIn PDF document text
    • http://twitter-center.com/webasto_heater_air_top_2000_st_manual59ruj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5fe1b2c07682e.pdfIn PDF document text
    • http://betmoy57.com/572830233521jnkb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_6029002e01e66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382004/normal_5ff0cee655bb1.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/uta_biology_degree_plan_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_604185277f354.pdfIn PDF document text
    • https://gapulujazupimes.weebly.com/uploads/1/3/4/7/134775062/janejebo_kupepizelotiga_gebojukisex.pdfIn PDF document text
    • http://exampl1214.com/15191094786zb8w0.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/polexebuj/yowhatsapp_v8._0.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/42328757092.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/asphalt_7_apk_life.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/39728163396.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/alien_shooter_2_game_for_android.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/veketewixunoliwosunina.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_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 5484 bytes
SHA-256: 1e983519cd88dd70ae02055e5ded59f36cbdb414f0daa514d5bfedd53a978bb9
font_01_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 10188 bytes
SHA-256: 020ea32d12c0f1cab65c2816c9c9d5680c40e8f7483b6ec717b12c847dfaec98

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