Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a1ae083dd2e390…

MALICIOUS

PDF

80.5 KB Created: 2021-03-09 06:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aa7a18ec54366a4719975df8a1b399d SHA-1: f1919e93b5d3caf486795b25e630e291d53ead48 SHA-256: a1a1ae083dd2e3905a06401d9434ea270aa169bec995297e41594974e774be65
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/123?utm_term=antivirus+avast+free++offline
    • https://xolojafiwonizup.weebly.com/uploads/1/3/5/9/135966724/6616939.pdf
    • http://rusherx.studio/49670179754cl7zy.pdf
    • http://kiwenalod.medianewsonline.com/how_well_can_you_follow_directions_worksheet_united_states.pdf
    • http://samozanyat.info/19391832148dgb2k.pdf
    • https://rofewure.weebly.com/uploads/1/3/3/9/133999154/tebafomewav.pdf
    • http://sreview.online/change_text_pythonlmjyr.pdf
    • https://jetujipizi.weebly.com/uploads/1/3/0/8/130813705/8515895.pdf
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/1124881.pdf
    • http://newsportstechnology.ru/443779388062cn00.pdf
    • http://paselon.getenjoyment.net/kindergarten_math_addition_worksheets_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_c502e241928144c5a9fb6fe68a0885ee.pdf?index=true
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_baa183c480fa4ad8b05be139bdf712e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e68b6a97-f383-4e8c-8c57-8d7068093191/what_does_a_high_absorbance_value_mean.pdf
    • https://uploads.strikinglycdn.com/files/db27412d-b45d-4944-ad01-9719cb712ec4/tetisevatufewiwefu.pdf
    • https://uploads.strikinglycdn.com/files/0ff80c80-6e41-45d7-94a6-d4601b619f95/neil_gaiman_book_list_in_order.pdf
    • http://nibopinalilabaj.onlinewebshop.net/nufuwatogon.pdf
    • http://zaxuzut.atwebpages.com/how_to_use_a_quote_for_a_topic_sentence_in_an_analytical_essay.pdf
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_82b0dbe04a2947669e93f6a21e90dce6.pdf?index=true
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_1bd2acee6558495b868f0a2758f56230.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9dfe9aa-c0ad-4f12-87ac-c5689c7f1983/pawimolubopu.pdf
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_49a8d220384448a5882641da204d1c04.pdf?index=true
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_bca2e233dade4ab6af23ef8f69e6050e.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_off0000ff74.bin
66fbec0438494fc9a4d86c4f3b9e51885e249a3c2b4b5c0644dba5feb907c864		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 4812 bytes
font_01_sfnt_off00010fe7.bin
1351183d2a20b9f4b555ab880a045b4c31d2d3dfa6ee03007f3ab1c93c244472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 10740 bytes

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