Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd3307fd9aa55c7…

MALICIOUS

PDF

65.3 KB Created: 2020-12-24 21:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 79af2d4a4319e1508bb223e0c255acd3 SHA-1: 76eb898097502211726612b2a02ae4a94d114eab SHA-256: 6cd3307fd9aa55c760bb14c2507b4ef85e2610734ac96e9890d6e3223d83454b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, suggesting a link farm or redirection to malicious sites. The presence of embedded URLs and the overall structure strongly indicate an attempt to direct users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=never+smile+at+a+crocodile+lyrics+muppets PDF link annotation
    • https://cdn.sqhk.co/pupevadojas/gh811Xf/dupusaxabivusemot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5fb7e0e46c079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_5faae7136af28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_5fae5397eadaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fc641001c881.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/3529386.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/sixewanosapunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_5fafffe7f3357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd50af5a-f540-4262-8018-801e1511c55d/wanetegaliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e927e9b4-7227-462a-8164-4afd661b6a83/stihl_chainsaw_ms180_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec340b2-83c8-412b-9add-da5cda1750c0/thn_y_ch_n_ting_trung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f3f949-192c-4760-bcea-86dbeff02dbd/raxejovopubomoledegami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b82333-4b9b-441b-b90e-adfc9889e3d2/how_do_i_get_rid_of_my_lawn_full_of_weeds_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdd3544-927e-48bc-bb3e-c5fae5ec4fc8/5259385731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cf78f6-1ac7-4d4f-8b02-a22ab48b4179/xujezesovaparena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a3e422-37ef-424e-a732-8455bae269bc/58371161696.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_off0000c1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F3 5352 bytes
SHA-256: 6a69cdcc1ff70fbd6b547650079b534a8608e442ee8188e72f4bddd56c957749
font_01_sfnt_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 10912 bytes
SHA-256: 42269957d3bb86bc19c60ca818bf7f2981daba187120923e44d51e5d86763015

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