Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6004d2ea4eeebc5…

MALICIOUS

PDF

103.7 KB Created: 2021-02-25 20:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a64c7a49e0f0b548791cb77992e462cf SHA-1: ff4ed7bcadd1c07f56055561835edc8104745e5b SHA-256: b6004d2ea4eeebc5f6dcbcedf235cbcc431bfbec278a616c49742b2ac0b297a4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector (https://yafferge.ru/strik?utm_term=the+uglies+book+quotes). The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure for phishing or to distribute further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+uglies+book+quotes In PDF document text
    • https://static.s123-cdn-static.com/uploads/4416321/normal_6000a7c43c77d.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/6xJjhgj/texas_a_m_corpus_christi_baseball_field.pdfIn PDF document text
    • http://generalmassage.online/itil_foundation_exam_study_guide_1st_editiongnsw9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_60229effb590e.pdfIn PDF document text
    • https://cdn.sqhk.co/gabotewobe/jaje9ib/bazaderivavuwes.pdfIn PDF document text
    • https://cdn.sqhk.co/xivorotil/hidjam8/vuxowakumalezi.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/1hjYjiZ/joker_original_music_score.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/JdijygI/tegefilizoxefarinozona.pdfIn PDF document text
    • http://begemotiks.space/dieta_para_hiperemesis_gravidicaxw8e4.pdfIn PDF document text
    • http://dragonflysagewellness.com/xemomapumifisozijoyr0ah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pavinudoj.epizy.com/suxulojefax.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/wisis.pdfIn PDF document text
    • http://fejusadifidexi.epizy.com/vufajirekuwakoko.pdfIn PDF document text
    • http://gaxilikezore.rf.gd/i_need_you_lord_right_now_chords.pdfIn PDF document text
    • http://naperopumo.rf.gd/homeward_bound_3_a_river_runs_through_it_cast.pdfIn PDF document text
    • http://zafuriket.rf.gd/29080883417.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015666.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15666 25032 bytes
SHA-256: 60a48820d3526922deb615b21cc186ebd6db98b0bbaba56bb6689b94474cc9c3
font_00_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 4696 bytes
SHA-256: 2d4b0cd94f68b12d6d6314a6b58f6a36897ecc133b1e6054c2dbc79e64800929
font_01_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 11524 bytes
SHA-256: ad3fd08508d3cdb1966080702ad5cd1112972dbfb3c8cad336b3e1469a956de9
font_03_sfnt_off000182f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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