Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f958e6cee68ee5…

MALICIOUS

PDF

86.6 KB Created: 2021-05-11 04:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 277977aa115caa76433233917c27e049 SHA-1: dc4f4ba5b7c320ad7ff8475d3c11137312585f58 SHA-256: 13f958e6cee68ee58dfa7ef56294bf0a8f2e4e88a29fae95a41eacd7d61fbda6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/strik?utm_term=gender+trouble+judith+butler+sparknotes PDF link annotation
    • http://rubeatyshop.xyz/dragon_king_bakugou_x_dragon_reader4odm4.pdfIn PDF document text
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/duvulifazutamuras.pdfIn PDF document text
    • http://winoraama.fun/64542962595gjo3e.pdfIn PDF document text
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/finoliwedafega.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/6d529.pdfIn PDF document text
    • https://kasureketox.weebly.com/uploads/1/3/4/8/134856927/zoramujenifago_gojatixo_gapugo.pdfIn PDF document text
    • http://repair-planshetov.ru/honorable_foro_mechero_2019m983w.pdfIn PDF document text
    • http://firstflirts.site/directv_genie_remote_not_workingqgzti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/60475759194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac65bb9-45a9-4b77-b219-373039937887/buwojifek.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/how_to_get_samsung_ice_maker_out.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/bujejumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1307eea-441a-45f6-82e4-8f004f5ab60e/44060811934.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_626c91e7823c4c2b9795889b48d75126.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/how_to_use_a_celestron_powerseeker_70az_telescope.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/reported_speech_exercises_intermediate_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/aimbot_free_fortnite_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4253bf58-510f-49ed-b3d5-a03943323b4a/2637437527.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/70596273300.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/complete_english_grammar_in_urdu.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_a6bfa046b17e4e35944ccc17a5a30ce9.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_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 5360 bytes
SHA-256: a91bf7a724bff4b2779758d4492eef8e816eaf1ebc44a8977b338d7dbb40f882
font_01_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 10700 bytes
SHA-256: 900dc9f1030087cc522eda120eade8d745051e0840e82192e9bbb298cc20729f

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