Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25ec3fb1d563f40…

MALICIOUS

PDF

45.6 KB Created: 2020-11-06 21:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f08df67c5368a936926206ed9bf64adf SHA-1: b36f285be5a184c65d8bb082e50168c9f624541c SHA-256: f25ec3fb1d563f4074c91051c4ba813952b48a16a75cceb40322534287b7ee56
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating it is designed to host numerous external links. One prominent URL, 'https://trafficel.ru/123?keyword=user+manual+samsung+galaxy+s10+plus', is embedded within the document body and presented as a user manual, suggesting a social engineering tactic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/123?keyword=user+manual+samsung+galaxy+s10+plus
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5fa05def12d12.pdf
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/zarakabikexinageg.pdf
    • https://cdn-cms.f-static.net/uploads/4451227/normal_5f9ec4b30d164.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/77429035c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/norozovijalu/sewage_treatment_plant_design_download.pdf
    • https://s3.amazonaws.com/padadutiseni/commedia_dell_arte_history.pdf
    • https://s3.amazonaws.com/wavunot/berdyaev_dostoevsky.pdf
    • https://s3.amazonaws.com/sikuva/bijedidejekukejigalug.pdf
    • https://uploads.strikinglycdn.com/files/5e400b43-f5a1-42bd-9b78-635b45cfb2f7/53315299044.pdf
    • https://uploads.strikinglycdn.com/files/6915dfeb-8135-405c-8fa3-6c9debdd1e9a/nebefazizoxup.pdf
    • https://uploads.strikinglycdn.com/files/8a160ac4-2329-45ae-866f-e6069a3389a0/89335172711.pdf
    • https://uploads.strikinglycdn.com/files/06c74b2a-f8d4-438a-a309-690a8b7589fe/benomabudavogebamokaka.pdf
    • https://uploads.strikinglycdn.com/files/3426fb4d-e6a8-48b0-b4ff-2287edd5cf89/sony_bvs_3200_manual.pdf
    • https://uploads.strikinglycdn.com/files/b1656ae2-b7cf-4891-a976-d9aab0e87fdf/permutations_and_combinations_proble.pdf
    • https://s3.amazonaws.com/tetazino/malakibo.pdf
    • https://s3.amazonaws.com/newopetusam/how_to_clean_a_skyy_9mm_handgun.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_off00007186.bin
52157672cec421b890efa2277468b6441ac669654da3402442382321fd3cd3f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7186 5492 bytes
font_01_sfnt_off0000842f.bin
514bc7ed05dd9949a0073175d77e3cd935ac97f707815ff4b2007e7eac515e74
pdf-font-stream PDF embedded font (sfnt) at offset 0x842F 10904 bytes