Malicious PDF — malware analysis report

Static analysis result for SHA-256 981bfa4972532211…

MALICIOUS

PDF

83.3 KB Created: 2021-04-10 21:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb07a025f409e6373c6406f9f086682 SHA-1: 2172ed60ef3a3b3551a1d8921a21bb31d3696e0a SHA-256: 981bfa4972532211ec72c8e7c8ac61da4acae70c557df8aae0a04e61ff350ded
156 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, a technique often used in phishing or SEO spam campaigns to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to exploit users by directing them to potentially harmful content.

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://vilenefex.ru/strik?utm_term=percy+jackson+3+full+book+online
    • http://jozejibojofeku.22web.org/39662338451.pdf
    • http://trells.space/zinukolovagazapwigmr.pdf
    • https://bonitolopulako.weebly.com/uploads/1/3/1/3/131384654/19923f4b6a.pdf
    • http://nukicew.xyz/31710786014fs7eh.pdf
    • https://sutiwipuxepol.weebly.com/uploads/1/3/4/5/134517417/352a1.pdf
    • http://galoomer.online/bhojpuri_new_movie_video_song_2019zvtw8.pdf
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/bukijaxexoto.pdf
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/favanerebepul-zomovofupukuka-ramiwogevego.pdf
    • https://rodedewosesuge.weebly.com/uploads/1/3/6/0/136010241/sidaruzafup.pdf
    • http://xazutakivad.iblogger.org/rodusabodimuwasetizunen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suramakoto.epizy.com/24674090344.pdf
    • https://uploads.strikinglycdn.com/files/800a947b-c67d-469e-b300-9604d5f5936c/bejamumiregifamukazapaxe.pdf
    • https://uploads.strikinglycdn.com/files/d7990d5d-5722-4aa6-ad95-0feeecdf8b3c/how_bad_is_buffalo_wild_wings_for_you.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/41407414615.pdf
    • https://s3.amazonaws.com/xomepixo/19869198023.pdf
    • https://s3.amazonaws.com/radubozufiwo/zibakiborawogedir.pdf
    • https://uploads.strikinglycdn.com/files/24da7d11-49c4-4b79-9ecf-597ba33b279e/rikisetoz.pdf
    • https://s3.amazonaws.com/resisuna/73260390913.pdf
    • https://s3.amazonaws.com/towakog/vijeguzuvuzekonomuzixagoz.pdf
    • https://s3.amazonaws.com/feliso/14552704495.pdf
    • http://zosenesewil.rf.gd/womivixopa.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/amar_bangla_boi_class_4.pdf
    • https://uploads.strikinglycdn.com/files/279b448a-52d7-4d6a-b94d-3c2bb56fb32c/mifowegefeg.pdf
    • https://uploads.strikinglycdn.com/files/8ca0048f-700b-4dd3-bfc2-c9e0e05a3850/how_to_greet_someone_in_latin_america.pdf
    • http://paguvodusijuwef.epizy.com/enter_into_vs_enter.pdf
    • https://s3.amazonaws.com/lazesej/tilumigopijebi.pdf
    • 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_off00010574.bin
da6102733a39f024e7a0b912de78fe78880ef4d236b66d732d48286310fb426a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 5420 bytes
font_01_sfnt_off00011805.bin
76933a89819b273ee9864ce44db97ae6a244222430c9bfac4957ccd61f6b13e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 11132 bytes

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