Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f8eb83d3189a48…

MALICIOUS

PDF

105.2 KB Created: 2021-03-19 09:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2252519decf96182acd455da299e2403 SHA-1: 669cc23f93b64e7c224d75dd53b5ac2744cd7096 SHA-256: a3f8eb83d3189a48afa8a290ef21fe6fa20b61a6b889a629ff4aec4d2bccae3c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, including one to 'fokemale.ru', suggesting a phishing or SEO manipulation attempt. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure and embedded URLs indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/aws?utm_term=oppo+bdp-105d+usb+dac PDF link annotation
    • https://cdn.sqhk.co/gukugifixija/sTheihN/english_stories_for_students_with_moral.pdfIn PDF document text
    • http://cybety.xyz/simurabureranukutajugofavtaxmr.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/4154365543.pdfIn PDF document text
    • http://artdebug.site/51158827031oiw6u.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/jc4sYjj/photo_editor_collage_maker_pro_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/xivumatozo/jcLum6Q/e_marketing_concepts.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/hYhisWX/can_summon_dragon_skyrim_shout.pdfIn PDF document text
    • http://appless.space/348321489756h5ye.pdfIn PDF document text
    • https://cdn.sqhk.co/retugatodof/gxHTMgc/anime_studio_story_1._0_6_apk_mod.pdfIn PDF document text
    • http://bestcreditcheck.info/marujawanizadiru51ur3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_d2681834366946f6968b8796f955b46a.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_7b8c97801775421b8d6b4e8df6d6308d.pdf?index=trueIn PDF document text
    • http://mixezized.myartsonline.com/banking_current_affairs_2020_june_banking_awareness.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/para_que_sirve_vitamina_b12_5000_mcg.pdfIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_c029e233bc5942e7ba3421f1534ada98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/74238812485.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_b32bdd5c7bcc41cc8a3c6c18752d0d2c.pdf?index=trueIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_c3629741e9284429a9203f34d2d72c10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/wiriwokivoxosafupetij.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9C 5456 bytes
SHA-256: 02dc3b4dad439ba1dc0c951fd21890ab331396dad4adba19f8f229072d817f24
font_01_sfnt_off00017140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17140 11316 bytes
SHA-256: 6a365afaa6274cbd95cfa9ee6b5a061df135ab56cf79a6a26e3709eb8666f4c3

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