Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dba1b3563e66f08…

MALICIOUS

PDF

86.0 KB Created: 2021-03-30 09:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2659aacffc243147cd04dc45c3b95532 SHA-1: df1d9d96ebdb2341ee91b5e55ab425ecbb4a8697 SHA-256: 3dba1b3563e66f08b73de69ca29e5e63b97bdcef1152ec6aecf07e3bae6c9df4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/123?utm_term=angry+photos+of+lord+shiva PDF link annotation
    • http://kopuvimu.scienceontheweb.net/how_to_turn_on_brookstone_cat_headphones.pdfIn PDF document text
    • http://ridegibulas.22web.org/c_programming_language_notes_free_download.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/xipiga.pdfIn PDF document text
    • http://4338bacchus.com/sorafudenorevenifuveyy3dp.pdfIn PDF document text
    • https://dobeluxujopi.weebly.com/uploads/1/3/0/7/130775615/aaf2363.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/lomevebulig-xipuwukesa-vujitisamij.pdfIn PDF document text
    • http://circus.market/basic_electrical_engineering_questions_mcqd1c0l.pdfIn PDF document text
    • http://ionatr.fun/nelinuwavoxinaejer.pdfIn PDF document text
    • http://zatawonilar.iblogger.org/bike_racing_3d_game_hack.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/kafibawakozavavoda.pdfIn PDF document text
    • https://fonabanobegax.weebly.com/uploads/1/3/1/6/131636781/ratunewotug-jexid-rizalexave-powupitetemoja.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://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_48f2c225325d4e5e95a76472b5dfb5ba.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_0189f45e036b4e94bb0eed4b3442f60e.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_54429962dbb949fda752157293c9f88c.pdf?index=trueIn PDF document text
    • http://katudajug.epizy.com/business_plan_booklet.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_5604e1a79e4946109c64a00e27896bee.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_421b62315e534784bf392406cbd9c1cb.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_dd1160c84be447ab83daaedcb49352d3.pdf?index=trueIn PDF document text
    • http://nobudusoselazo.epizy.com/visheshan_worksheet_for_class_1.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_248ecaf3f1e44148836be67added8e62.pdf?index=trueIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_2a0e212b0ec6484d806f268601264cb8.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_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 5124 bytes
SHA-256: 5e9c9f4c937387c0a3f79dbd29a5a282d35c749a076cee450f715167127a0d51
font_01_sfnt_off000119fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 10088 bytes
SHA-256: 160e706c12f24538f7318ccfa7738c1a9ead55048e70b9ecb25efa37cad9d5ba
font_02_sfnt_off00013c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C11 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230