Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f7788015b7dfcd…

MALICIOUS

PDF

70.5 KB Created: 2020-12-31 16:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa103da5320524d06a5f8de56c04b9aa SHA-1: d99e866a71a6fbf938c3069b4b807682dd087cc1 SHA-256: 70f7788015b7dfcd7fb6afa5808ac5a6dd7e26ba998b460efc79c09201a6bbd2
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One prominent URL, https://trafffi.ru/strik?utm_term=overkill+3+hack+pc, is directly embedded and suggests a malicious intent, possibly related to phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=overkill+3+hack+pc
    • https://lifufokawalujiw.weebly.com/uploads/1/3/4/6/134687559/wizuwi_fipupakijegib_tiwiko_fozuvi.pdf
    • https://cdn.sqhk.co/kedilexele/wiblijg/52617960231.pdf
    • https://cdn-cms.f-static.net/uploads/4452595/normal_5faef5a2c5b7b.pdf
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/pezixalozazexubit.pdf
    • https://static.s123-cdn-static.com/uploads/4388835/normal_5fe25998b3b2e.pdf
    • https://mugekezozo.weebly.com/uploads/1/3/1/6/131636766/kamumopukadulinubul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jevedijadiki/wuzenirusoxajozu.pdf
    • https://uploads.strikinglycdn.com/files/7c103e49-a81e-4f15-bdbd-39fe142dae7f/babemevoban.pdf
    • https://uploads.strikinglycdn.com/files/ec0801e2-0fb5-49e7-8e50-8323e6e6ad8f/gavonuvu.pdf
    • https://uploads.strikinglycdn.com/files/5d2ce13b-b64a-4c8c-9d50-c97602101577/senimazumibezowibewexe.pdf
    • https://s3.amazonaws.com/sulasatevirexo/95032490282.pdf
    • https://s3.amazonaws.com/nonabafat/pert_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/77114b13-21c1-448e-9b60-bc12ec5f824d/xafoxevisixamevamud.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_off0000d660.bin
00c9a46e444f80b2b9a7a99a4efbb3e65f8b0aa0897296b840e12088dcc814e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 5156 bytes
font_01_sfnt_off0000e7f4.bin
0a8ec9d0e5eb30c2bdb16c32dbaa73604e94d2812025007d2c16d17b47d58c3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 10872 bytes