Malicious PDF — malware analysis report

Static analysis result for SHA-256 3743662e87f91996…

MALICIOUS

PDF

81.8 KB Created: 2021-03-25 00:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85a393433c62d3f797de83e8e36db297 SHA-1: 82dbd27f9c35b3c7bb136096da874844e32fea59 SHA-256: 3743662e87f919961aa0aaa35aac3dc264b1f64493ad065e8efcbcab97141685
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF SEO link farm. The primary URL points to a suspicious domain, suggesting a malicious intent to redirect users. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/award?keyword=el+baldio+augusto+roa+bastos+pdf
    • http://damodudajipofem.22web.org/96669553959.pdf
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/974d69038831d2f.pdf
    • http://fiduwil.iblogger.org/what_should_the_mother_of_the_bride_wear_to_a_winter_wedding.pdf
    • http://kersita.space/bijukipefoditurodzoou.pdf
    • https://wemovimezatura.weebly.com/uploads/1/3/4/6/134611727/4628190.pdf
    • https://zulukewawebipu.weebly.com/uploads/1/3/4/7/134745728/wanuja.pdf
    • http://masovizifuzaro.iblogger.org/is_dad_supposed_to_be_capitalized.pdf
    • http://lnstagram-helps-contact.com/nintendo_wii_rvl-001_blackgs0yv.pdf
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/fubeboramoneso.pdf
    • https://lenagabonozizaj.weebly.com/uploads/1/3/4/3/134314127/0298fe6e079224.pdf
    • https://lirisuvobuku.weebly.com/uploads/1/3/5/3/135399047/rapiluni.pdf
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/7984533.pdf
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/rulijudakugifi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://falufobi.epizy.com/schedule_b_2018_form_1040.pdf
    • http://xanojeja.rf.gd/how_to_become_a_registered_nutritionist_in_australia.pdf
    • http://kotasogova.rf.gd/bearded_dragon_diet_sheet.pdf
    • https://uploads.strikinglycdn.com/files/a0630d4b-991a-4fac-831c-bcaa98a1d84f/how_to_review_a_picture.pdf
    • https://uploads.strikinglycdn.com/files/37d7e02d-796a-41fc-a1b2-4066e0200b21/cuisinart_dcc-1200_brew_central_12-cup_coffee_maker_manual.pdf
    • http://zoxuleresuxenez.rf.gd/administrao_de_marketing_philip_kotler_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d8.bin
0474ce63e1e4c9262c35f75bea60140c3b762842913d43d281019dad4848bbaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 5304 bytes
font_01_sfnt_off000104ec.bin
7b8a3a487ee2e5444157934a6b2f9a04bfaae6942ccf5c002da768f31a739ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 11172 bytes
font_02_sfnt_off00012a7a.bin
2df60db25c4006ebf5ce7f30ca7461b7931ff48239c1caafece913cf4cb3b6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 16136 bytes

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