Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aec4bed371bfb4…

MALICIOUS

PDF

133.7 KB Created: 2021-04-25 09:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a00690b62d65c454140a623b4ed559a4 SHA-1: 7269e733811ba1b5b9c171661b781fa4c7883d34 SHA-256: b6aec4bed371bfb489b44a52154ab74538dec87b352da206099e7fa84b40e097
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, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The document body, though partially corrupted, suggests a lure related to a 'wiring diagram', which is likely a pretext to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/strik?utm_term=sunvision+pro+24s+wiring+diagram PDF link annotation
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdfIn PDF document text
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/d1fc9606cc22.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/eb7a79.pdfIn PDF document text
    • https://tumafivefaj.weebly.com/uploads/1/3/3/9/133999435/zuwewimi.pdfIn PDF document text
    • https://paluwewokob.weebly.com/uploads/1/3/2/7/132712057/fuvovetinuwexuk_palefu_famijuninevi_kebomuxewo.pdfIn PDF document text
    • http://toxedajenoxin.66ghz.com/canon_ir3300_printer_error_codes_list.pdfIn PDF document text
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/83718e21f285cc4.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/fojesivib-mawigu.pdfIn PDF document text
    • http://zotaravaka.22web.org/brazil_flag_coloring_page.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/d8b2af58.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/33341237262.pdfIn PDF document text
    • https://xuwatezifi.weebly.com/uploads/1/3/5/3/135305435/6d88c07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_b9e6714bd4534fbe9c621e3cde1be31b.pdf?index=trueIn PDF document text
    • http://tumizasikoxef.rf.gd/wexodamarexujusajuki.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_b3ee7c0d163a41598059e9b0438311b7.pdf?index=trueIn PDF document text
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_f158b10a26dc4b6b9ce966dee98ea6f8.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_07f24b3e4a024e7ea9c53208d827061f.pdf?index=trueIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/swift_payment_system.pdfIn PDF document text
    • http://labimovoguduwej.epizy.com/mathematics_for_economics_and_business_jean_soper.pdfIn PDF document text
    • http://poteluvomak.rf.gd/33435750729.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_f6b13af3bf65471597f022f181318552.pdf?index=trueIn 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_off0001c068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C068 5408 bytes
SHA-256: d7d620ab8f3a96b4792cacedb381f3373f0f581402845faea1c57326c04a3a5b
font_01_sfnt_off0001d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2B3 11768 bytes
SHA-256: ad6bbaedb6b33fb6efa6fbe10de77dffb5f8bea4227d4c0a08553756b7e03e17
font_02_sfnt_off0001fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA98 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176