Malicious PDF — malware analysis report

Static analysis result for SHA-256 d168ff32b1fb2f52…

MALICIOUS

PDF

75.5 KB Created: 2021-01-20 20:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9af64066572c61fde889f263b92305d3 SHA-1: b6bb3b7bf64fdf70a3e973ba58a4a719706f54da SHA-256: d168ff32b1fb2f528b801d3568f7817db123620b16fe7e53a2de32eede6d624d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a redirector link to `https://gettraff.ru/123?utm_term=ads-b+antenna+amplifier`. This suggests the document is designed to lure users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing or malicious PDF.

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
  • 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://gettraff.ru/123?utm_term=ads-b+antenna+amplifier In PDF document text
    • https://cdn.sqhk.co/vobipibomuk/jvi2hg7/parkour_servers_for_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/jjardha/17586081929.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/irMyjdL/traffic_run_play_for_free_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5fe9fc3193606.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/eH2Znie/74253072312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fdb600c6acc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_5fb037c42e7c5.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/eIJUgjr/facebook_messenger_mobile_data_usage.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/P1geP6Q/anonymous_texting_app_promo_codes.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://pikuvideposem.epizy.com/ridulatesipegadalezoso.pdfIn PDF document text
    • http://wisalawisavu.epizy.com/a_companion_to_arthurian_literature.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/logoduve.pdfIn PDF document text
    • http://jutejuviwolopis.rf.gd/samomuzijonubezo.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/bavewotiwozuwu.pdfIn PDF document text
    • http://zezunas.epizy.com/3487236792.pdfIn PDF document text
    • http://bojonovaja.rf.gd/linear_function_tables_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 5024 bytes
SHA-256: 98a5d28c68a5708c9614590c7dad4c393d64f6089f2c068ce06ec8ebc633c605
font_01_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 10704 bytes
SHA-256: a0cd0bc9feab5ea29db61a14c1092797b9297aa357c7f179a51d230ccd35b9a2
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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