Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c91b18fde53858…

MALICIOUS

PDF

81.6 KB Created: 2021-03-26 13:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59a235318cb73b13da9a112ecdd9b750 SHA-1: 770754d94e870081ad51dcb83aca7817a512baa7 SHA-256: 35c91b18fde538581ab7d4e34ef7c820022dd4cbcc703724f0b0ed379a8c5b67
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV also detected this file as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous external URLs indicates a malicious intent to redirect the user. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=waste+to+energy+market+pdf
    • http://vawabipoxe.sportsontheweb.net/the_100_startup_book.pdf
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/3683019.pdf
    • http://fuvagezilavez.mygamesonline.org/how_much_concrete_does_a_bag_of_ready_mix_make.pdf
    • http://xuritepizib.mygamesonline.org/sevuxizowufofipetoke.pdf
    • http://tinesemexogo.mygamesonline.org/antarrashtriya_sangathan_book.pdf
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/7239351.pdf
    • http://bikejesoxatelo.mygamesonline.org/wofolufimapana.pdf
    • https://nekamefirojes.weebly.com/uploads/1/3/0/7/130739169/lenerevivugafe_tewowus_jabezemapaz_gunesuza.pdf
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/kimasesuma-dafinovivera-vaberala-faxevavewuxoke.pdf
    • http://penageli.getenjoyment.net/75581165599.pdf
    • http://lixorajepidil.mygamesonline.org/soxomifejaregero.pdf
    • http://gukevipagopu.mywebcommunity.org/loridodifutoxafopaveviz.pdf
    • http://zutolewe.mywebcommunity.org/vemorolotefob.pdf
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/ranifuzuwawuwom.pdf
    • http://lisuzigerob.mygamesonline.org/how_do_you_activate_a_command_block.pdf
    • http://kogutojoveso.mywebcommunity.org/xonusaxenikelepiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_b2b1ae2c49444cd9ac1f5859ba1a824b.pdf?index=true
    • http://nabulegewuwal.myartsonline.com/makro_catalogue_2020.pdf
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_2fda8d75093c4bda92b4365d92f710bc.pdf?index=true
    • http://sopexalibip.onlinewebshop.net/fusisuzite.pdf
    • http://pudolajuji.atwebpages.com/wefudejutilisepopu.pdf
    • http://foduxidepozipiw.myartsonline.com/linux_system_administrator_job_description.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_off00010168.bin
6b7aac76b7710e7fdcff4035581116e141f918c2fd57ecfdb031c47dd0db7781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 5508 bytes
font_01_sfnt_off00011425.bin
24c7d09bafc4765d6e6a7f1f47dd8b6532b51ccd5724dcd53909b5ae75fb9991		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 10980 bytes

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