Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bd1cbba2edad38…

MALICIOUS

PDF

70.2 KB Created: 2021-02-16 21:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e8ddc1b5b4191e1422024edb2f43fa9b SHA-1: 77e44728466bb4aefd40448ff80b794ab65bf01f SHA-256: 86bd1cbba2edad384acb0e941152b626bbed26a0d4de4201e52b8427f075614a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'bologen.ru', which is suspicious. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to manipulate search results or redirect users to malicious 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://bologen.ru/123?utm_term=why+is+my+cable+box+blinking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497109/normal_601a47d1a8cd4.pdfIn PDF document text
    • https://xozavefo.weebly.com/uploads/1/3/4/0/134018900/e02ddf4fb.pdfIn PDF document text
    • https://momiweporav.weebly.com/uploads/1/3/4/7/134745900/todifiwoxeje.pdfIn PDF document text
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/zekarusuzulosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5feaf05abe3b7.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/geb9hgO/blue_cross_blue_shield_ma_find_a_doctor.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/muronumikuka_guxexixef_dozigoloxad.pdfIn PDF document text
    • https://sowofodifidem.weebly.com/uploads/1/3/1/8/131856479/jepalup.pdfIn PDF document text
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/9a174.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/FgiiVjj/civil_war_battles_1864_november.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393883/normal_5fe4fec37ebac.pdfIn PDF document text
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/3275465.pdfIn PDF document text
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/vomup.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/iaEEtha/nukajoj.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/nunakixuma/wallpaper_hd_for_android_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/69836560973.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/human_anatomy_atlas_2018_free_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/bus_stop_telugu_movie_songs_free.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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 5504 bytes
SHA-256: 523c73b04733c464f8bde3166a98fd96b212e88c59317babce81bf0b980cb926
font_01_sfnt_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 10352 bytes
SHA-256: 1802ee8d2887ba561886ca7837e47de520a3222d0ffb6b28b56e29a00655c7f8

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