Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed782fb499e2721f…

MALICIOUS

PDF

80.3 KB Created: 2021-03-29 17:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7d4948fbd45d39d3bc7ef294348cb815 SHA-1: 04966409080b9f9aeb043ca2d10219b17c662bbd SHA-256: ed782fb499e2721f22b000729fe9baeb5482385dd09dbf45df9525a59927578c
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 hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/wix?keyword=chapter+3+functions+chapter+test+form+b+answers PDF link annotation
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/xujivolijoluxudelugi.pdfIn PDF document text
    • http://tuworiki.22web.org/93961154015.pdfIn PDF document text
    • https://xemewewekakefo.weebly.com/uploads/1/3/5/4/135401485/826ccf16ee24.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/sapebewaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/ijchhM9/12775095533.pdfIn PDF document text
    • https://melugazeso.weebly.com/uploads/1/3/1/1/131164252/jemuzizovuxaro.pdfIn PDF document text
    • https://cdn.sqhk.co/betarudigi/giz5Yhi/hockey_training_center_minnesota.pdfIn PDF document text
    • https://lonunupamazukev.weebly.com/uploads/1/3/4/7/134711915/677aa123406.pdfIn PDF document text
    • http://kibizife.iblogger.org/bopazabilimuzom.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://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_b76c8557ad29486c908d613108fc4469.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_7bdf14e884f34f1c8cd642540ad6fd91.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_6c600217609c42118e2ef5c5326d8af3.pdf?index=trueIn PDF document text
    • http://nawaroxepemif.epizy.com/encyclopedia_judaica_vol_13.pdfIn PDF document text
    • http://xogonat.epizy.com/78254498776.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_62b56a0323eb4058ae5c7d3de0f00935.pdf?index=trueIn PDF document text
    • http://tininababa.rf.gd/75012544320.pdfIn PDF document text
    • http://kafopazam.epizy.com/bemirinefegupovopijuvega.pdfIn PDF document text
    • http://sosekemuzunenu.rf.gd/approximation_by_superpositions_of_a_sigmoidal_function.pdfIn PDF document text
    • http://vepifanaberuw.rf.gd/wedazotob.pdfIn PDF document text
    • http://seninode.epizy.com/22580671371.pdfIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_ab84ec79aba54a4e8d31894d84bf90ca.pdf?index=trueIn PDF document text
    • http://fefekug.rf.gd/rererazazin.pdfIn PDF document text
    • http://vibodox.rf.gd/wikalono.pdfIn PDF document text
    • http://bidilud.rf.gd/98136765718.pdfIn 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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 5524 bytes
SHA-256: b9b69f43cb9bca4e468eda1f14aaecf024ad7dec3cf704c6f18b81f470d8f554
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 11128 bytes
SHA-256: e3932e2088c53ac8b2123112850626d470a8059b2ee88ed16f0ac8df9afd6e7d
font_02_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333