Malicious PDF — malware analysis report

Static analysis result for SHA-256 5503883f08974e23…

MALICIOUS

PDF

127.0 KB Created: 2021-03-15 09:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b66d6b58f19f4bd4fc5cad77c5632ce SHA-1: 8d721f759f0da919963066231c3cbdd43e97a67d SHA-256: 5503883f08974e23a1f370560c9312ed1745d9884318957cc13bac3f9bf1fee6
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it is designed to host numerous external links, likely for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing or trojan activity. The embedded URL points to a site that appears to be a lure for product reviews, potentially to mask a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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/wb?keyword=review%20lasko%20ceramic%20tower%20heater
    • https://bovagisobupuzod.weebly.com/uploads/1/3/1/0/131070774/xujizifakozuf.pdf
    • https://cdn.sqhk.co/pesenexur/ceYxwib/titunuzeme.pdf
    • https://cdn.sqhk.co/zatovafer/3hE7Shh/nekudox.pdf
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/zapuvupamiluruw_munozelisowu.pdf
    • https://cdn.sqhk.co/relulapezele/Whfjcdb/hearts_online_247.pdf
    • https://cdn.sqhk.co/kogewole/MjcrWgi/civilopedia_5_fr.pdf
    • https://cdn.sqhk.co/kebokeregim/qSieo9N/zadiwolujojefawapo.pdf
    • https://cdn.sqhk.co/kuzosexiwugu/jaghjc2/razenom.pdf
    • https://cdn.sqhk.co/vovewotutal/aohecjb/jazilinugesuzunuwogi.pdf
    • https://cdn.sqhk.co/nizivatitogu/Nidniex/ion_ice_auger_blade_sharpening.pdf
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/6322273.pdf
    • https://bekarofadu.weebly.com/uploads/1/3/4/3/134346179/livewumim_taxumuraporok_pajan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zosevid/sobobatibuwiwewew.pdf
    • https://s3.amazonaws.com/fisulefajow/december_1_2018_sat_answers.pdf
    • https://uploads.strikinglycdn.com/files/5856ad65-50a0-487f-9e76-f236f433a28f/monster_meaning_in_bengali.pdf
    • https://uploads.strikinglycdn.com/files/0e27f4b4-865e-4261-ad04-90274d2de9e6/how_much_is_pabst_blue_ribbon.pdf
    • https://uploads.strikinglycdn.com/files/efa56287-480d-4a85-b176-762437d00ae8/fererajupozukasu.pdf
    • https://s3.amazonaws.com/waduzirader/how_to_work_as_a_medical_receptionist.pdf
    • https://uploads.strikinglycdn.com/files/87305dd0-2b56-4d2d-addc-d40f5a6d8e92/las_edades_de_lul_libro_extracto.pdf
    • https://uploads.strikinglycdn.com/files/ecf3ec2d-28a8-4435-bf8a-40b15de8848c/3910254509.pdf
    • https://uploads.strikinglycdn.com/files/e9568b9b-cdee-4ece-aa9b-f8d0e43fcd2e/74791382413.pdf
    • https://uploads.strikinglycdn.com/files/ae4afbba-dd1e-4b19-b05d-440f0f1c30cf/sub_zero_36_inch_refrigerator_dimensions.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/british_tv_channel_guide.pdf
    • https://s3.amazonaws.com/gitipelut/dopexikopade.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b442.bin
27cbd84af014c7c96acf1e75a1af97795e3d30a1ac7ea7ba26af2c71863a768c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B442 5264 bytes
font_01_sfnt_off0001c614.bin
9c38517cb66b2a3980b7d5fc0eeb86ab93fd575261da59575f5f9d2c5ae9c220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C614 11912 bytes

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