Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c4967772e9c3f2…

MALICIOUS

PDF

80.4 KB Created: 2021-03-20 07:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6db0aa18a04a3521d787bd216377ed21 SHA-1: d1b7b9363960a938b2518303cf8c6d5659d0b200 SHA-256: a4c4967772e9c3f2fa09e8013df2e1ee3fc31211613df26243c515c342681ebe
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or distribute potentially harmful content. The primary URL observed is fokemale.ru, which is likely part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=feriado+do+dia+01+de+maio+pode+trabalhar PDF link annotation
    • https://cdn.sqhk.co/pedidagow/if8hcvY/mmx_hill_dash_2_mod_apk_download_uptodown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5ff90adfb2f4d.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/hvggjca/80186045989.pdfIn PDF document text
    • https://betewobinolatid.weebly.com/uploads/1/3/4/7/134756009/bisokilit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_602e019d3a33d.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/dOiCZTA/cheat_minecraft_ps3_bahasa_indonesia.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/hrhdHT0/16513901391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_600d976ecb23a.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_602510c3c436b.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/bb8ac3760.pdfIn PDF document text
    • https://gidepezugubuwo.weebly.com/uploads/1/3/4/7/134766768/2559109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444869/normal_6046cb3ac1e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_603e74d58751d.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/0KgisjM/ketajirulaxad.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/pabopudovowola.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/09cf41c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_600b9edcc2772.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5ff5c54fd3d0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db00cf7b-adfd-48bb-bb51-7be74e9a0fc3/how_to_change_the_hepa_filter_on_a_shark_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da9b38f-5841-4991-a952-939e2d5c8607/tree_of_life_knitting_pattern_afghan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05514863-2799-4890-8022-33ba374be5e7/what_is_the_story_of_pet_sematary_2019.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 5312 bytes
SHA-256: 94f78bd55d1277edf1b97c763d090c399fe19f28434de4f3e7e93a3c6df07474
font_01_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 2344 bytes
SHA-256: b8e04332c9677abac35b615770ed5c5ce59a56c693dbafcf418b3602212d3833
font_02_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 14144 bytes
SHA-256: 3ef4d1927e2a032db52f481d2b8f76216d7d896eff287a82c2f5da4992e38106