Malicious PDF — malware analysis report

Static analysis result for SHA-256 162bac1b9e2877f8…

MALICIOUS

PDF

72.3 KB Created: 2021-03-19 19:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b1e14342e7c1910608d2b7df415470 SHA-1: 2471ff6b27c6a4a416c1c3fab2331054fd7b8977 SHA-256: 162bac1b9e2877f8c934a6799b15743fe3398cba46df743b9bcc3bb33bda447d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. This suggests the document is designed to manipulate search engine results or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=effective+public+relations+cutlip+pdf
    • http://ketaton.mywebcommunity.org/tecumseh_engine_identification_location.pdf
    • https://static.s123-cdn-static.com/uploads/4416787/normal_60007b31ed0ce.pdf
    • https://cdn-cms.f-static.net/uploads/4428054/normal_6009f0873fd9a.pdf
    • http://bazunujovi.scienceontheweb.net/vipotijireziravidof.pdf
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5fc69c7222ff9.pdf
    • http://tapopapebesawu.getenjoyment.net/14511918815.pdf
    • http://joriwolujuf.sportsontheweb.net/basic_life_support_2020_aha.pdf
    • https://cdn-cms.f-static.net/uploads/4417413/normal_600a190de3708.pdf
    • http://minesaxofunawi.getenjoyment.net/8350114197.pdf
    • https://cdn-cms.f-static.net/uploads/4413369/normal_603e9b035e099.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_e99b336156b9481e92e178aaea75fc35.pdf?index=true
    • http://puzexexaniledow.epizy.com/ergomed_annual_report.pdf
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_07e913ced86b4528aa44774572985ea6.pdf?index=true
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_631bf46ad4e440b0a8786808724b1aba.pdf?index=true
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_f4d0b309c9ce46cca773a5602841b224.pdf?index=true
    • http://pasivete.epizy.com/43413299425.pdf
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_1063eea0c63b4325be22a38e4afbfc8f.pdf?index=true
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_36dc49bb3e3745a3b835a6999c465f99.pdf?index=true
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_61eab7bb6ea9435797917dd5961e7b17.pdf?index=true
    • http://masekafisixovok.epizy.com/esl_grammar_articles_worksheets.pdf
    • http://xikusaduxofi.atwebpages.com/is_natural_language_processing_deep_learning.pdf
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_c7760f38e9a6454c8f3a876f2e18f6e9.pdf?index=true
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_6d3145a2a13748b3b535491688690009.pdf?index=true
    • 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_off0000da4e.bin
6abfc529dab4ce8a3cf732bafb57b14f065d1d9f2efb9129be7f3466de9fccc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 5308 bytes
font_01_sfnt_off0000ec6c.bin
e6366663b3e1e719490f235dd0b78d59a2df868dbf8cc5ba908c4c9836a589ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 10944 bytes

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