Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaae7be6a3c5a9e…

MALICIOUS

PDF

83.0 KB Created: 2021-03-16 12:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eba5b4bb660886066eb5abd68d0faf4 SHA-1: 257570247f41e5fec286a497b82e4bd952c42ee0 SHA-256: cbaae7be6a3c5a9e0232138e4b34848d5aa3cf838b33da43ec954045ad1a1ca5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated for SEO purposes, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure and numerous URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://seumenha.ru/award?keyword=sindrome+de+friccion+de+la+banda+iliotibial+pdf
    • https://cdn.sqhk.co/kitaparek/gjghgkM/12342311198.pdf
    • https://cdn.sqhk.co/bitizulokiva/jj8CibF/33286086650.pdf
    • https://vukuwapebu.weebly.com/uploads/1/3/5/3/135310377/a350f.pdf
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/788505.pdf
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/popelafelewali.pdf
    • https://cdn.sqhk.co/pipagalax/iocgeie/piano_tiles_2_free_online_game.pdf
    • https://cdn.sqhk.co/bisulalu/rdAgdYH/debumodomipitalurisumodam.pdf
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/josiwubutajujidi.pdf
    • http://volewug.iblogger.org/bluestacks_3_windows_8._1.pdf
    • https://ganuwikudafo.weebly.com/uploads/1/3/0/7/130775291/3581687.pdf
    • https://cdn.sqhk.co/vopunokapire/RQlibra/fuzanapatamula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_2e59ca8f6c0f469c93b64bac93f7e3aa.pdf?index=true
    • http://dizigudaz.epizy.com/dynamics_of_machinery_question_paper.pdf
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_9fc1a9fc1cb34901abb2ecb5cd469c8f.pdf?index=true
    • https://s3.amazonaws.com/voxulija/25451911001.pdf
    • http://moganip.epizy.com/bartenders_guide_jerry_thomas.pdf
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_f62d4235c0fd4a8dabe99c7ae254e903.pdf?index=true
    • http://neropalumej.rf.gd/kinob.pdf
    • http://dofumexuvit.epizy.com/racing_moto_bike_game_free.pdf
    • https://s3.amazonaws.com/gazijewevan/what_is_ninjutsu_martial_arts.pdf
    • https://s3.amazonaws.com/dogevazapiwediw/employee_evaluation_form_definition.pdf
    • https://s3.amazonaws.com/xujitezu/64105448226.pdf
    • https://s3.amazonaws.com/widetunipet/wobexudodupinozu.pdf
    • https://s3.amazonaws.com/vebisop/audio_happy_birthday_song_free_ringtone.pdf
    • https://s3.amazonaws.com/rurovikejigibu/juxidomoziginiwi.pdf
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_24b2df06962c49f191d29fa304c52498.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106f1.bin
a5072ec8fc21c32218ff5b5278116d53dd7cc951d4e9275b4bf6884115957c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 5364 bytes
font_01_sfnt_off00011913.bin
939008e19a9bb122afbfcf03844ae3a8bdac892f21002aa1b8f05e3600a3e9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 11520 bytes

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