Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ef8caf13c010bd…

MALICIOUS

PDF

69.9 KB Created: 2021-02-03 06:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 64ba54174d2ee99cce74b65e0478d410 SHA-1: 7f2db9c606cdcf2ca098bce15291782cf4c9545f SHA-256: 52ef8caf13c010bdc808885b12231673d28769ee222396f83eca613f9b45583f
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content or phishing sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/123?utm_term=hot+air+rework+station+vs+heat+gun PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5fcb2238c2463.pdfIn PDF document text
    • https://seruvexude.weebly.com/uploads/1/3/4/4/134404645/9352966.pdfIn PDF document text
    • http://berkeciftci.net/bajo_el_sol_de_toscana_gratispx18x.pdfIn PDF document text
    • https://cdn.sqhk.co/rirerujel/3ififTl/ninja_hero_turtles_runtime.pdfIn PDF document text
    • http://badgesverified.com/38353539477pb5et.pdfIn PDF document text
    • http://sweetmeet.online/holland_lop_color_breeding_guideq2xy6.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/ghvuxgg/21278676657.pdfIn PDF document text
    • http://mp4.design/hard_boiled_detectiveuorwf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416302/normal_5fe53e05c1146.pdfIn PDF document text
    • http://govnososal.xyz/91487296483gi3xb.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/cggBtja/82330765737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485149/normal_5fde6527c3b57.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/rorabekenazozi.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/gGDHxif/89532357049.pdfIn PDF document text
    • https://cdn.sqhk.co/pemofirojez/hjid9CY/51001545414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fcb9453497e7.pdfIn PDF document text
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/1d9199b0a0e35e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 5092 bytes
SHA-256: e426be55f704936249b634291b0d2a5312722e94e3a0fefded13834beb5174dc
font_01_sfnt_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 10596 bytes
SHA-256: 31db7d77bb5c2b1d7dac2b37baa9c5f02d17ea096cdf25ad1893cef1c89c88f3

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