Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9a07f9fef12c1d…

MALICIOUS

PDF

72.6 KB Created: 2021-03-17 17:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7b194744638523fb881550a4ba6097dd SHA-1: 2285bd2d6b2fc2ac23d09d052b379a5abff46eb2 SHA-256: 1b9a07f9fef12c1dc88f7a9fc342367cafa46ded99c7c759afeffebe0df5d5e0
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The primary URL, 'https://fokemale.ru/wix?keyword=arithmetic+sequence+worksheet+algebra+2+pdf', is presented as a search result, likely a lure to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=arithmetic+sequence+worksheet+algebra+2+pdf PDF link annotation
    • https://cdn.sqhk.co/baresupujar/IHhih9S/3804318477.pdfIn PDF document text
    • http://zaliv2k20wowowowoow.xyz/mystery_word_puzzles_printablerwar4.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzememub/bDB7iiA/soul_knight_pc_multiplayer.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/iA0jfic/ufc_fight_card_tonight_predictions.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/hb9ogc2/bumajupezot.pdfIn PDF document text
    • http://winnerslm.space/3422298211j952l.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/jbQuUWy/fusoram.pdfIn PDF document text
    • http://mscgis.net/basic_linux_commands_learnmctx7.pdfIn PDF document text
    • http://bitsracing.net/tixanekoxuzemuwovabubmhau.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbcfe24-1155-4bfd-af4f-9481e16eab9c/how_to_pair_altec_lansing_life_jacket_speaker.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/pezaxigolaruzeziliguguk.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_480c11b495b44e7f853662e449a0d683.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajuse/68264145908.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_596d4dfde7714257864546bdeb3b55f7.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_dafcb7f478e6472a943a8f99441c0531.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d127c17-bed4-4159-baba-b4c035dd3849/75229547660.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_f3da2050bd4b4c95bbd8ecad2b35ca3a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 6112 bytes
SHA-256: a70859adbfa43d9c8f0cac44a15c3ba8256362e282184945e95506e38566fdb3
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 11060 bytes
SHA-256: db2d030b920059db2a521d93a383abd508fad3873b634593a43d3a5b751dbab0

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