Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f672064c7b3025…

MALICIOUS

PDF

81.4 KB Created: 2021-03-25 08:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79ba6d994396a94b0a40d4f6ae200a27 SHA-1: 94c6d1a0879e7826ee7c21714dcb402e4883f95f SHA-256: f2f672064c7b30258f8c5163758b2bb0473a6003752030a44e58e6833d82b140
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/award?keyword=advanced+computer+architecture+syllabus+pdf
    • http://wivuperafuzo.mypressonline.com/kiwowugajirigibeba.pdf
    • https://cdn.sqhk.co/niserutom/gtWVGW4/used_wood_chris_craft_boats_for_sale.pdf
    • http://mimivudarevi.scienceontheweb.net/63292522091.pdf
    • http://wiboratiraveguw.mygamesonline.org/fibuvetizunutubif.pdf
    • https://cdn.sqhk.co/busumodofu/b1ABlgi/among_us_skeld_map_minecraft_tutorial.pdf
    • https://cdn.sqhk.co/sativomofij/jfMarm8/first_murder_hornet_nest_found_washington.pdf
    • http://sujimelowakolop.medianewsonline.com/rupusar.pdf
    • https://cdn.sqhk.co/pefevepufi/hXhdsii/wormax._io_2_online.pdf
    • http://xovitixekewelom.scienceontheweb.net/panorama_francophone_1_cahier_d_exercices_answers.pdf
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/5546246.pdf
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/4907544.pdf
    • http://bulubuzigajuzar.getenjoyment.net/blender_2.9_tutorials.pdf
    • https://cdn.sqhk.co/borefigux/fZhsjgc/fezumixifuwosasebexogageg.pdf
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/migifeweworig.pdf
    • https://cdn.sqhk.co/zarepowake/Y3hapig/echo_voice_recorder_app.pdf
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/zoremagoxiziwag.pdf
    • https://cdn.sqhk.co/satukevaguka/wjehe4M/veporubadafupa.pdf
    • http://sudilufib.getenjoyment.net/fufaronegon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wozimape.onlinewebshop.net/55154660634.pdf
    • http://ludugatitabi.atwebpages.com/51814375354.pdf
    • http://pudolajuji.atwebpages.com/calendario_lunare_gennaio_2020.pdf
    • http://patudesaruvob.atwebpages.com/por_qu_o_porque_ejemplos.pdf
    • http://sajulugebimisu.myartsonline.com/general_topology_nicolas_bourbaki.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_off0000fe69.bin
d9ae27136f378fbbc7cb0a683c84dddcbcf5696e05be5b17512918b50353243d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 5684 bytes
font_01_sfnt_off0001119a.bin
19cdcd9614e2fe5efbd6cf63535d175b3546c7282b61522955047fedcfee0a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 10640 bytes

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