Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ff2b0205e56996…

MALICIOUS

PDF

90.1 KB Created: 2021-02-11 23:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 77c3cbbcc9a082c6999479a1c295095d SHA-1: 785187befd7f99b40c3fdb1778029eb93427dec1 SHA-256: f7ff2b0205e56996a7789e60e4b796518391a4f15b9e89d6eb7068c0bee689ce
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external links, many pointing to potentially malicious domains, and is structured as a link farm. The embedded content, though obfuscated, suggests an attempt to disguise the malicious nature by referencing a manual, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/123?utm_term=whirlpool+quiet+partner+iv+manual PDF link annotation
    • http://e-devletturkiyeaidatsistemimgovtr.com/46445886850a0cxk.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/91UcWjg/dasixeriguvaligaw.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/ighcjj2/71611579019.pdfIn PDF document text
    • http://openchambre.xyz/vomuteehe3d.pdfIn PDF document text
    • https://cdn.sqhk.co/jogibigeda/ii0vib5/heartstrings_meaning_in_tamil.pdfIn PDF document text
    • http://doorstepcomputers.com/48151328057y2ud4.pdfIn PDF document text
    • http://fb-pageunderreview.com/60061927403d4sno.pdfIn PDF document text
    • https://xapidusexinixov.weebly.com/uploads/1/3/1/3/131382907/0fa01f2d52e7bbc.pdfIn PDF document text
    • https://rigopodi.weebly.com/uploads/1/3/4/3/134307943/7e3b5d3.pdfIn PDF document text
    • https://rokajovata.weebly.com/uploads/1/3/4/3/134376264/fusod-ralakod-buripefo-lezofo.pdfIn PDF document text
    • http://canonsburglake.com/wine_tasting_score_cards6z6p1.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/jhfmidl/werewolf_the_apocalypse_official_video_game.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/luxelula/lejinijamupuxemo.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/alaipayuthey_songs_free_isaimini.pdfIn PDF document text
    • http://walevuzu.epizy.com/relieving_letter_sample_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/9th_class_date_sheet_bise_sargodha_2019.pdfIn PDF document text
    • http://tukuponuvul.epizy.com/video_call_app_free.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/32063626272.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 5080 bytes
SHA-256: 428c30674dc311c802da6ddd316d1c743383c37a02bb81a8bfeb8c434dffc641
font_02_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 2108 bytes
SHA-256: e2bafc4364e6d6b986abb62f8dad7bbc84fcdddfc7e738cffae9bddef9bc1c72
font_03_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 12688 bytes
SHA-256: 33acfe51ff579f1d3abf29e1144d0ead68e36830d7f8c839c7032496e57b7b06
font_04_sfnt_off00014370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14370 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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