Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6dc0eeae0d58606…

MALICIOUS

PDF

69.9 KB Created: 2021-03-08 03:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 992acae97fd9ef2fee0384ce8bf943a6 SHA-1: d639310576c7ae13df671d85176d91b9b6b019e5 SHA-256: e6dc0eeae0d586062146b2ea2768182965de4527374c950547d1f5d3d7adcab1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. This suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to a link-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=brother+lc101+ink
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/fezarusorenoxuwevav.pdf
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5fe36698c98ef.pdf
    • https://rakerekibakefe.weebly.com/uploads/1/3/4/5/134596095/1456752.pdf
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/favilenoruzupo-sidosogup-zopenetipob-rolojanaraxopo.pdf
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/ferujete_sakigatawuko.pdf
    • https://static.s123-cdn-static.com/uploads/4489244/normal_5ff97f3323953.pdf
    • https://cdn-cms.f-static.net/uploads/4388158/normal_601f845e4b45c.pdf
    • https://xidifapub.weebly.com/uploads/1/3/0/8/130873728/9993502f7.pdf
    • https://cdn-cms.f-static.net/uploads/4365627/normal_60255964ee672.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a2cf690-48a8-4161-8dd2-b780b7e9b120/piximofomoga.pdf
    • https://uploads.strikinglycdn.com/files/53d62e04-f683-46bc-b6d0-c4544a6360f0/likuwuxefaverebub.pdf
    • http://vatujub.rf.gd/5319495001.pdf
    • https://uploads.strikinglycdn.com/files/168e1dba-3ef8-44e5-92a2-ac7fb967e0c4/zogevapewip.pdf
    • http://roxigivakupumun.epizy.com/85085524153.pdf
    • https://uploads.strikinglycdn.com/files/d8973f68-f7a7-4808-b899-5bf40b4fb848/6327045821.pdf
    • https://uploads.strikinglycdn.com/files/a03616d8-11ef-47d3-aac9-9c1bfbdf0f90/similar_figures_worksheet_8th_grade.pdf
    • https://uploads.strikinglycdn.com/files/e2c10220-267b-48ce-b7dc-9e42a17f370b/24128393388.pdf
    • https://uploads.strikinglycdn.com/files/144edbc8-3519-4213-89ea-000160e1390d/37635740188.pdf
    • https://uploads.strikinglycdn.com/files/37912a6c-5182-426d-a386-82533cd71c5f/statistical_significance_confidence_interval_definition.pdf
    • http://vonolukover.epizy.com/archicad_19_for_mac_free.pdf
    • https://uploads.strikinglycdn.com/files/c2283988-892b-41a5-871d-790b67fafb15/100_aos_de_soledad_frases_amor.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_off0000d4eb.bin
56cccd2b9d72280223f2fcce0a06c05bc12df134c26bb36ecf6c9bd8fc29b707
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 4804 bytes
font_01_sfnt_off0000e548.bin
66b94ad4d01aea8001bea4aa737b72c5907dcea455d3fa7f024fa609d4b43741
pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 11036 bytes