Malicious PDF — malware analysis report

Static analysis result for SHA-256 338ba73c7fba5ba8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 10:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a63888a42d1ab0a766606f2c92d427f3 SHA-1: f0f36dbb045824f28abb7f9cf38932901ea40fe4 SHA-256: 338ba73c7fba5ba8f1f665cc020faa7c50c791add466654c2c7f59763821a210
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and ML classifiers. It contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 30 external PDF links. The primary external URI points to a URL that appears to be part of a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://zajinet.ru/award?keyword=baskerville+a+sherlock+holmes+mystery+pdf PDF link annotation
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/3911551.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/90096938356.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/maze_runner_saga_order.pdfIn PDF document text
    • https://gifaxopolipo.weebly.com/uploads/1/3/0/7/130739444/nolopasegepu-wulovo-lovitupeke.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/lego_harry_potter_5-7_codes_pc.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/4151c3a6473226e.pdfIn PDF document text
    • https://woxumonukoke.weebly.com/uploads/1/3/6/0/136090180/0e27db.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/povelenavuviw/mesupekomatilebirabur.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/30846627645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27c73a1-4bfc-4b62-8937-9a18576044cd/21452789349.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/torodatanopalusumixumevix.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/itr_1_sahaj_acknowledgement_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/51481702772.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/cambridge_a_level_maths_past_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/free_bigasoft_video_er_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf8a74b-072d-42a1-b513-168be31986de/best_math_books_for_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/kilepelazokeradis.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/47040702860.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/worksheet_3_literal_and_figurative_language.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/league_of_legends_pick_em_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8c52a0-c2cd-4797-a638-b13e22b5cce0/wulomuxubom.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/7266071964.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/hopscotch_julio_cortazar_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/febrile_seizure_guidelines_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6ef162-8406-4937-99c7-48d927093b49/keperafosapozujejesobin.pdfIn 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_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 5668 bytes
SHA-256: 4cb15af545815b9efc201dfdb10023e99341cbb0a003cb9803e869d8746c4d0f
font_01_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 10664 bytes
SHA-256: 06bf6dfd51c694e79e2ab06460372ca7d50fcc27778553a292958d426be2ac82

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