Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd16b5ddc4fae77…

MALICIOUS

PDF

106.0 KB Created: 2021-03-19 03:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2dd9c04030e96e14628a36fbb9aeee5c SHA-1: b83cd9a0d048bc38a938dd0fa7f2027ba17de4ef SHA-256: 0fd16b5ddc4fae777c5778205e4feecab3003425e3ff07ec812c7801c89a4d7a
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, including suspicious domains like 'soxebez.ru' and 'lowwsaw.xyz'. The document body, though heavily obfuscated, contains metadata suggesting it might be part of a deceptive SEO strategy to attract users searching for specific information, such as reviews for 'Cercle de la forme tolbiac'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://soxebez.ru/123?utm_term=cercle+de+la+forme+tolbiac+avis PDF link annotation
    • http://lowwsaw.xyz/jabolijipebulezobuzq81i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_5fe769cadf52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_6041692dbd080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5fc5d4198cbc2.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/00b0c1a5a76967.pdfIn PDF document text
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/bakovowipejovo_folug_fukuzut_benarufofug.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/bible_old_testament_and_new_testament_differencezr41h.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/bizapumozuxuxodagixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368218/normal_5ff6395414c80.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/23259229229.pdfIn PDF document text
    • http://findfreegirl.com/zoranarodasafesakoahpfj.pdfIn PDF document text
    • http://znohist.site/brihaspati_dev_ki_aarti9ka9b.pdfIn PDF document text
    • http://kyrgyztours.com/asu_map_transfere67g6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_e987f97c7bec41b19ed981da8c96d9b6.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_818be6c567d44b57aca9128cae01b960.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_90c26e3875fa45cf8fd187b49df01989.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_7e051abca7fb4128a8a83b28b3f31730.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_eda662c20add49b7aaa4fb93ac80dc5d.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_5f9f00bd7d32439b9d5c2bc0cabc57f7.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/breadman_plus_owners_manual.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_635ec48d5d39497692bfea619368d2d5.pdf?index=trueIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_2d47851b883742108011c093e8054532.pdf?index=trueIn 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_off000147b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B3 5272 bytes
SHA-256: 469e1cc055949da6c0ca0d1d43abbd066869f5611e471d0e72146fd4e9810ede
font_01_sfnt_off0001598d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598D 13840 bytes
SHA-256: 81b2b6dc5783bb5080bf402bdb6794438e7c2eeca3f93c251bed9364de1c5d74
font_02_sfnt_off00018536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18536 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501