Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ab09bf507a9722…

MALICIOUS

PDF

71.2 KB Created: 2021-01-31 23:34:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7e619cae5dffd686372ca7d7bb060493 SHA-1: d4d7abe4a5d8c052939dd6306b53a14fd9f30dcb SHA-256: d6ab09bf507a97225d3c379ff5e773f573c1211d94a6031f802d47a8f84952c5
126 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/aws?utm_term=chunar+video+song++mp4 PDF link annotation
    • http://maewallace.com/hello_starshine_fontitxcl.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/ZhdQgey/2713363249.pdfIn PDF document text
    • http://tixshopclub.space/83170456782mcg5j.pdfIn PDF document text
    • http://xodikiz.iblogger.org/gubusuzemuleligubaku.pdfIn PDF document text
    • http://womenita.fun/bimisoxijejuwozobowf8h7p.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/eftMGgj/vififutokuk.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/9gitBXj/durexojafizefux.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/giegi4z/ponemeseserigovefafegex.pdfIn PDF document text
    • http://curvepreloved.com/ac4_trke_yamaik3qg.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/jcgcFgh/swing_low_sweet_chariot_lyrics.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/nolarifaforuxop/19030695680.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/connected_but_no_internet_access_android.pdfIn PDF document text
    • http://zepinurubav.epizy.com/68643399152.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/gepisajiwobuner.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/pexobovu.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/routard_birmanie.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/heavy_menstrual_bleeding_rcog.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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 5392 bytes
SHA-256: 14860e113e57693a2aafdc4911367fb54f7dc91edeb58a377bbd859e3048a1f2
font_01_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 11376 bytes
SHA-256: 3c863e2f832a0101a493a0912db3643d76f849b5d60dd95b471a777a54b1a687

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