Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedbef446f0cc8a6…

MALICIOUS

PDF

75.2 KB Created: 2021-02-15 04:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8ef75ef9ff293b853bdd8a5fce1f7f17 SHA-1: 62d1659d4e681d09d3abb7c77337ea0b2564f0b5 SHA-256: cedbef446f0cc8a6145d5b1e7d1436ecc9cf9e0878675e1c0eef9775b1ec4c75
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many of which point to S3 buckets, suggesting a link farm or SEO poisoning attempt. One of the primary external links is to 'bologen.ru', which is likely part of a phishing or malicious redirection scheme. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=pittsfield+maine+registry+of+deeds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483365/normal_6000b6e14ed34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_5fd21d649e6d9.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/hgIUge9/tiny_clear_bubbles_in_urine.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/e1KYiMK/last_island_of_survival_protected_mode.pdfIn PDF document text
    • https://kufaxaza.weebly.com/uploads/1/3/2/6/132680799/gajukawade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475716/normal_5fe2e3816267c.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/Cezihc1/pezudexomatuzile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5ffe2c579cf13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_601c030a51b50.pdfIn PDF document text
    • https://cdn.sqhk.co/milatepoz/GudjiTk/96663296888.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/fjeioEG/new_english_songs_2019_download_muzmo.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/ehdeajW/crossfit_buddy_throwdown.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/zasepo/27249352210.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/hair_changer_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/badmaash_company_movie_moviescounter.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/tobawekepewotade.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/bcbs_additional_information_form_nm.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/uniform_circular_motion_simulation_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/pataal_bhairavi_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/96468268294.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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 5328 bytes
SHA-256: 5b42b34446a22e5a6c1db8df1ab29c8061e7686e160563bac517aecca58b7734
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 10420 bytes
SHA-256: 7bed530296025f402ea2661c1987f4b5e5ed50ef41085a99530c7c0e4a317e92

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