Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc698d533a15843…

MALICIOUS

PDF

75.8 KB Created: 2021-01-20 12:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 245f8b956144a7c9774790e0591a4d31 SHA-1: 808273ff82861a538f04bd8cc764c69413d77cb0 SHA-256: 7fc698d533a15843eddec6ac56787056e98314d81a6262014f61a82e604944b1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to domains that appear to be part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. The embedded URLs, such as 'https://trafftec.ru/123?utm_term=gta+san+andreas+police+mod+cheat', suggest a lure related to game cheats to direct users to potentially harmful content.

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://trafftec.ru/123?utm_term=gta+san+andreas+police+mod+cheat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408866/normal_5fcd3ba9a3705.pdfIn PDF document text
    • https://buxijabis.weebly.com/uploads/1/3/5/3/135329720/zuzivi.pdfIn PDF document text
    • http://kiwaliguza.iblogger.org/9476370147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f89b6e721bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_5fbd85697e7af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_5fb57af76bc90.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/jfDVJjf/too_many_balls_in_the_air_response.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5f8e29fe3e40a.pdfIn PDF document text
    • https://cdn.sqhk.co/sadoburola/c074vsr/ocotillo_wells_weather.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzigipo.epizy.com/bakrid_mp4_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/32655340432.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/multi_level_2d_wavelet_transform_matlab.pdfIn PDF document text
    • http://tupudenijusab.rf.gd/fomirudofajamaninen.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/avast_offline_definitions.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/judak.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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 5344 bytes
SHA-256: 0a1dde1b7986e0ef4d8ed6967a43642f1cce9a480ebc283acdce8f1a8115cbdd
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 10816 bytes
SHA-256: 28a49596bf54bedd096ab2777396aa82e4a89082615fadf2f08ea912b3084349

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