Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9f96472e0992c6…

MALICIOUS

PDF

76.3 KB Created: 2021-02-08 17:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7eefb83028e3f94618dad32c6dc2a215 SHA-1: d89a3dcecd9270729f62f3933d2d6c1e1702bce5 SHA-256: de9f96472e0992c643a0b9f8164f81fa4e3a2740be318c2c66361fe79d8d2096
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent.

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 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://baarspo.ru/123?utm_term=sportsman+guide+magazines PDF link annotation
    • http://praktika-ingenieur.com/33222913370lbkrc.pdfIn PDF document text
    • http://podjem2.club/vuxoxugufazegolezikuti6gtxa.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/8391578.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/DmjfmSR/64356613424.pdfIn PDF document text
    • https://divaruwidis.weebly.com/uploads/1/3/4/0/134042650/zoxeki.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/iV1jcpf/football_coach_shirt_ideas.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/2206842.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/rixevozajixezos/secure_vpn_proxy_apk.pdfIn PDF document text
    • http://bedevekozazabe.rf.gd/23408073256.pdfIn PDF document text
    • http://xofaxisenulomav.epizy.com/atelier_totori_endings_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/23890982060.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/hyperbole_and_a_half_free.pdfIn PDF document text
    • http://zavivemigowoson.epizy.com/55799129421.pdfIn PDF document text
    • http://pumumiz.epizy.com/tifazagovebuwujunela.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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 5400 bytes
SHA-256: 5a3e04a161ed462c9c91c1938fa777490e69d0e0c81cf89813758b32e084ed18
font_01_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 11156 bytes
SHA-256: 6c8932a3fb626ba300e70b6caf082b60458e6cb64f2ea920dc84e068e706af4a

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