Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bebdce22cc9710…

MALICIOUS

PDF

82.4 KB Created: 2021-06-06 16:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b196381bd310527db1e1638e3f280af SHA-1: 378c428ffa8e1785343dad93daee08e8da643a36 SHA-256: c5bebdce22cc9710927ac545dab9910bb7374332aa92b1b358b9a6a1f0e2481d
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on Weebly, suggesting a link farm or redirection mechanism. One of the embedded URLs, 'https://allytemp.ru/pbw?utm_term=linear+demand+function+definition', is likely used to redirect the user to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://allytemp.ru/pbw?utm_term=linear+demand+function+definition
    • https://wemedasexokava.weebly.com/uploads/1/3/4/5/134512162/901f3621.pdf
    • https://javodamujuwevef.weebly.com/uploads/1/3/4/4/134446411/f84d0f351f.pdf
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/429675.pdf
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/tusuvusixaradox-gelaxitojonapoj-dexanodaduwem-lawerorita.pdf
    • https://cdn-cms.f-static.net/uploads/4408594/normal_606a86beb8513.pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/a9ed1bc037d1.pdf
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/paziriluzivok.pdf
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/vujosetisiso.pdf
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/fafuxopo.pdf
    • https://lumikefobebodas.weebly.com/uploads/1/3/4/3/134324067/kixuziwi-tudojijagu-gebozolugeg.pdf
    • https://cdn-cms.f-static.net/uploads/4423189/normal_604ee599b7bd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8d8ef83b-094c-47da-ae84-c6d8b172128f/rezadajutopepurodexofimor.pdf
    • https://uploads.strikinglycdn.com/files/addb7324-3caf-4609-826f-1403df5d0f6f/carnegie_learning_integrated_math_3_volume_2_answer_key.pdf
    • http://nikekuva.pbworks.com/w/file/fetch/144597618/need_for_speed_most_wanted_2_rar_ifresi.pdf
    • https://uploads.strikinglycdn.com/files/f5b37b8e-b4ea-4fcd-ba7e-a3e8fce81b0c/what_is_the_true_symbol_of_christianity.pdf
    • http://vifogajo.pbworks.com/f/epson_adjustment_program_resetter_l130-l220-l310-l360-l365.pdf
    • https://uploads.strikinglycdn.com/files/806ba816-8ffc-4a8a-8ad9-b29c8e8f2059/38715618209.pdf
    • http://sikovifif.pbworks.com/f/bon_appetit_pressure_cooker_manual.pdf
    • https://uploads.strikinglycdn.com/files/815cff50-e979-4613-bf82-3f4e78eeb5ab/journey_to_the_west_the_demons_strike_back_movie_cast.pdf
    • http://gijorugisaw.pbworks.com/f/2866622839.pdf
    • https://uploads.strikinglycdn.com/files/cf002f6c-c2f2-410f-a847-c73fc167a266/70278602805.pdf
    • 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_off0001033d.bin
363f326a87013843e75dbc8d4b41e341671899253276db1589b762afd63cc54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 4900 bytes
font_01_sfnt_off000113db.bin
0e6e7bfe1ac20d38037eae2f672c98d81d942f2055217446e9b28c0dcf6dc316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 11948 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.