Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37193ee401f35e9…

MALICIOUS

PDF

102.8 KB Created: 2021-01-16 12:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7b3b431341c75c964650c3d3a1672344 SHA-1: 98f4d82fd1c5b898d063d0b3603cfaa3c993bae2 SHA-256: b37193ee401f35e997321bd7f1fd6c1b13505955c83805afbadd74ca5a3df83f
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://cctraff.ru/aws?utm_term=computer+certificate+design`. It also exhibits a PDF link farm heuristic, indicating an attempt to distribute numerous links, with `https://s3.amazonaws.com/vatosolikijike/dna_replication_molecular_biology.pdf` being one example. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=computer+certificate+design In PDF document text
    • https://site-1180269.mozfiles.com/files/1180269/samsung_split_screen_s9.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/hjfiWje/face_changer_camera_pc.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/temuremim-jitit.pdfIn PDF document text
    • https://site-1168281.mozfiles.com/files/1168281/dilaliwojaliganowowotit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/dna_replication_molecular_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/72273851919.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/samantha_berglin_attorney.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/children_s_beginner_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/information_about_tata_business_support_services.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/sotabaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/tawipun.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15706 5348 bytes
SHA-256: dc4b2c7b538240867bc1b823be9def57fe4f5e3eabffb1bbc711149e8b0193ff
font_01_sfnt_off0001691d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1691D 10916 bytes
SHA-256: 8835d2030fda2ebe77bd64d82d01a2b44926da83d1dc1d3b9e8abd4cc059fd00

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