Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77ab4739df97fbb…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 19:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 310c836acd0180d353348e250db7c6a0 SHA-1: e21c552614ec90e8942497e057c5b8321059614c SHA-256: c77ab4739df97fbbf12b04b0c392002967ac4930d3ae87215fbf830e045cbb52
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/pbw?utm_term=allah+hu+ki+naat
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/godigulalotumururufu.pdf
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/newomenexelugo_dimazafexova_rifewizin.pdf
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/metiwevofuwiridepix.pdf
    • https://pikemane.weebly.com/uploads/1/3/4/7/134775920/7828580.pdf
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fd5faf5444ae.pdf
    • https://karupijelajedo.weebly.com/uploads/1/3/4/8/134878973/8932680.pdf
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/jiwebapubu_wefosejupezezi_dopijasitanifix_vufoxoziselobi.pdf
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/gegezesega.pdf
    • https://dixatobuvug.weebly.com/uploads/1/3/5/3/135321084/funibewosapisozif.pdf
    • https://meverelalopabij.weebly.com/uploads/1/3/4/1/134108836/5046187.pdf
    • https://cdn-cms.f-static.net/uploads/4376611/normal_60b910bd29ab3.pdf
    • https://fitatopiwize.weebly.com/uploads/1/3/0/7/130739398/8809a705b4.pdf
    • https://cdn-cms.f-static.net/uploads/4381751/normal_605846061a96f.pdf
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/vuzajena_zegegilunomamu_xorerusozuruduf.pdf
    • https://ralakugifobiw.weebly.com/uploads/1/3/4/5/134589758/vuvubutakosixakiduwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://taxoxuf.pbworks.com/f/what_happens_in_chapter_9_of_the_kite_runner.pdf
    • http://nigezid.pbworks.com/w/file/fetch/144416958/resignation_letter_format_in_word_hindi.pdf
    • http://jivevisubido.pbworks.com/w/file/fetch/144598182/fubunoxa.pdf
    • http://nilanom.pbworks.com/f/4233872345.pdf
    • http://dawijunegolo.pbworks.com/w/file/fetch/144577143/66160123998.pdf
    • http://vadibun.pbworks.com/f/21758594192.pdf
    • http://zolunegoli.pbworks.com/f/86966165843.pdf
    • http://nigezid.pbworks.com/w/file/fetch/144574644/26782096902.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d597.bin
c6e3ca49953d69ce8edeffe468335b8ab3dc423a9b5414de3c630508a3e465c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 4552 bytes
font_01_sfnt_off0000e50d.bin
c7b61fc980d48d4c9dfdbd35b1a3259a4d9f07572a95889f704bf4543d479245
pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 11776 bytes
font_02_sfnt_off00010ca8.bin
bb9e5d2fb3c71c34f2d7102fc39c49032b7056587e624f3251cd772decccaa0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 16316 bytes