Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcf13633fb7b435…

MALICIOUS

PDF

77.9 KB Created: 2021-03-18 19:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e5ae7bf0a4b40a6a4fb3a45cbc7a2cc9 SHA-1: eee4efee8600923d5a2f4937f13a0bac27c1032b SHA-256: adcf13633fb7b43586a796624a3b9097dc49029bec27359ce012f1b08ae765a6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting domains, indicating a link farm designed to obscure the ultimate destination. One of the primary links is to 'seumenha.ru', suggesting a potential phishing or malware distribution lure. No scripts were extracted, but the structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=1+peter+1+13+25 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393889/normal_6021fd94b61a9.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/3cf5d6d24d093c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fefbf109fbcd.pdfIn PDF document text
    • https://cdn.sqhk.co/fekurisakez/8Hhjgfo/15409525329.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/he1eTge/74648269928.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/ZujgxGp/tinkler_noun_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_601b4971e4f53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5feba08f4ab75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503033/normal_5fd7d1f35907b.pdfIn PDF document text
    • https://cdn.sqhk.co/saboretiki/d96Hiax/ninja_sushi_mililani_delivery.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/s0whfTz/hatchimals_colleggtibles_list_season_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503767/normal_602ad53aafbbd.pdfIn PDF document text
    • https://cdn.sqhk.co/jasolizilaf/jaigvgh/ice_cream_roll_machine_price_hyderabad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5fcc425bd9b9b.pdfIn PDF document text
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/d627ea9fbd9156.pdfIn PDF document text
    • https://cdn.sqhk.co/vubenexew/dihggcQ/deutsche_telekom_ag_annual_report_2017.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/kowezekexanena.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/mibethd/tasepamolomujijizurewoko.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/6wBxnij/space_invaders_deluxe_schematics.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/logipizabizo_wopobegupo_maxitewojitat.pdfIn PDF document text
    • https://wokabilizivamu.weebly.com/uploads/1/3/2/7/132712023/kajig-bopibawamuso-maruwukuniki.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_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 4768 bytes
SHA-256: 0e0a39d93cd89501a088df911580bffc2f378709037dc04a06debed6d279ea7e
font_01_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 10504 bytes
SHA-256: 57511edcef7fe030cee4aebd0376fb45c8107ef941049ce602de608399e9375b