Malicious PDF — malware analysis report

Static analysis result for SHA-256 f190e77fca371114…

MALICIOUS

PDF

80.1 KB Created: 2021-01-21 02:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: af3d2920bd3d193f529471d8350f1362 SHA-1: e8a4797e770b0c734337c1b8fc7a7e5375a4e655 SHA-256: f190e77fca3711141b9e3e7a2a12ebd553399ff6145834968681a633d2958f53
252 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/aws?utm_term=video+star+app+for+android+apk In PDF document text
    • https://cdn.sqhk.co/torujazelome/cpaBuTu/dikapororitevetavapiso.pdfIn PDF document text
    • https://doguxugufini.weebly.com/uploads/1/3/0/7/130739878/8995907.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/g5uibih/paxofuvusaruvekalobudab.pdfIn PDF document text
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/8325714.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/U9MJ3a2/siwiliko.pdfIn PDF document text
    • https://cdn.sqhk.co/siwowoso/34UjMyH/56228623140.pdfIn PDF document text
    • https://finikepimu.weebly.com/uploads/1/3/4/0/134017618/6466d010b4f450d.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/gehfhfb/kakogexoxavenopujafarow.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/pexifibevu.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/i7mhhib/hoverheart_hoverboard_manual.pdfIn PDF document text
    • https://site-1180682.mozfiles.com/files/1180682/bingo_town_live_bingo_games_for_free_online.pdfIn PDF document text
    • https://site-1218703.mozfiles.com/files/1218703/abc_australia_tv_guide_cambodia.pdfIn PDF document text
    • https://woluxubofij.weebly.com/uploads/1/3/1/3/131383763/7149278.pdfIn PDF document text
    • https://site-1195763.mozfiles.com/files/1195763/chocolate_recipes_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/O9Kgeii/bass_pro_shops_promo_codes_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomekurufe/R1Z70Qc/nujafugotopap.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/votubukaxogilix/butedametigifonuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/bodyguard_video_songs_hd_1080p_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/choriocarcinoma_chemotherapy_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/gp_minor_surgery_audit_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 5032 bytes
SHA-256: 70dcfa3b2d1a8dc92232d6352520742a7ac55cb8531883d2024d884eb2190f16
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 12008 bytes
SHA-256: d2f757a8e0e7fe96d39355616662c835e62181125e26f23e895aef00b7177867
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 16064 bytes
SHA-256: 569f756873fd89e9ac54c2be6ee8ad0a68594ee77c2378937be7521d336ae4b9