Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae7b768b3beae06…

MALICIOUS

PDF

80.0 KB Created: 2021-03-22 00:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7416db09f6aba02ce40ab978f63bf2a1 SHA-1: 937cc984c8c11f6e02c139df6fcc0c36940a4329 SHA-256: fae7b768b3beae0613d579d1b850cf5f7bf05ede03f4f2ca661793bbba72f7bd
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector. The primary malicious URL, 'https://yafferge.ru/strik?utm_term=times+tables+worksheets+1-12+pdf', likely serves as a gateway to further malicious content or phishing pages. The presence of a large number of external PDF links suggests a link farm strategy, potentially for SEO manipulation or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=times+tables+worksheets+1-12+pdf
    • https://zunelejodimoje.weebly.com/uploads/1/3/4/5/134526095/kabadimuwuj.pdf
    • http://fishland.store/the_burger_shop_wake_forest_menuulf5o.pdf
    • http://odebayitrafikhizmeti.com/jakiwigaregoko43guq.pdf
    • https://guwevene.weebly.com/uploads/1/3/1/4/131437413/fuvawamiforagel.pdf
    • http://lnstagramcentre.net/data_warehouse_and_olap_technology_for_data_mining_slidesharegrl8r.pdf
    • https://pigasuranebuja.weebly.com/uploads/1/3/4/4/134459694/ludamutajafi.pdf
    • http://kemamibuke.mygamesonline.org/lowes_canada_community_grants.pdf
    • http://ig-support-service.com/nfl_trade_rumors_washington_football_teamahefr.pdf
    • https://nokivuvaxeg.weebly.com/uploads/1/3/4/5/134594014/nivetom.pdf
    • https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/9335183.pdf
    • http://dilawiputonu.mypressonline.com/kenmore_high_efficiency_washer_and_dryer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xefezesebusu/brainpop_states_of_matter_quiz_answers.pdf
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_f647d377834e4a61929987a79cddc5e4.pdf?index=true
    • https://s3.amazonaws.com/mokuwanibof/sentry_safe_key_will_not_open.pdf
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_b03094830ba949e985b876233627ad70.pdf?index=true
    • https://s3.amazonaws.com/dobikasukavu/awlgrip_flattening_agent_data_sheet.pdf
    • https://s3.amazonaws.com/tosevud/crack_office_2010_kmspico.pdf
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_79fe9c6429c340d890cad414a627d827.pdf?index=true
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_2fffa5c1a9dd4fcaae9376461387486f.pdf?index=true
    • http://gegilifopom.myartsonline.com/kissing_booth_book_online_free.pdf
    • https://s3.amazonaws.com/jevelel/15761427496.pdf
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_61a4a22026ff46528d10dbb44041fad3.pdf?index=true
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_eec96c2605d548e482fc05aebb204021.pdf?index=true
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_96fc427bd3734e16840b2ddc76ef704e.pdf?index=true
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_af238d1baa9841a6a746a50689806295.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9e.bin
4ada64032760cca95b60b5744cfc457fa5d805a3ee67fccd729adcb020ac49a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 5424 bytes
font_01_sfnt_off0001001e.bin
beecd37a277973230fd2ea2cd61bc735babdf151fd2d464b931afea5cceb0546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 10580 bytes
font_02_sfnt_off00012456.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 4324 bytes

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