Malicious PDF — malware analysis report

Static analysis result for SHA-256 236bce61b570f996…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 21:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097e14e4f8fa752e8157dd9817ae783c SHA-1: 1de03b357962af32c134b9ce9a49838624b43def SHA-256: 236bce61b570f9967273287879a8cb60ab5b4d90a5ddcaea40344f7842d9185d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a likely attempt to redirect users to malicious content or phishing pages.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=cellular+respiration+labster
    • https://cdn-cms.f-static.net/uploads/4451350/normal_603411bc1d739.pdf
    • http://witikotuxigere.scienceontheweb.net/is_20000_leagues_under_the_sea_a_childrens_book.pdf
    • https://cdn-cms.f-static.net/uploads/4487622/normal_6048c73bafb4d.pdf
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/kulegimekazurododav.pdf
    • https://cdn-cms.f-static.net/uploads/4471475/normal_60469f3378e94.pdf
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/4463ebc.pdf
    • http://popularchoice.space/vikitirunekopifafojafuiu616.pdf
    • http://rigudozefogo.mypressonline.com/english_grammar_exercises_intermediate_level.pdf
    • https://cdn-cms.f-static.net/uploads/4469351/normal_6049cf3de9309.pdf
    • https://cdn-cms.f-static.net/uploads/4418575/normal_601fb2abac9b5.pdf
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/wujetabokunubol.pdf
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/85af616adff.pdf
    • http://woziwowariv.sportsontheweb.net/rezegokedamixik.pdf
    • http://smartycredit.info/us_history_regents_answers_jan_2018pem0x.pdf
    • https://cdn-cms.f-static.net/uploads/4381973/normal_602aded90e738.pdf
    • http://complect-tech.ru/xizanabanulazadk16f0.pdf
    • http://mukinumatonewo.getenjoyment.net/piwomotuwosikefarejuva.pdf
    • https://cdn-cms.f-static.net/uploads/4380675/normal_600fd8cf7c08c.pdf
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5fdb6d766c2d0.pdf
    • http://lukiduxipapep.mywebcommunity.org/55411472131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_6cfbd8f0a8eb4d6f853ddc9acd4bbc56.pdf?index=true
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_cbf3ded405e7486bab83dea9f7299235.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_off0000e819.bin
2be3676f89ffd2689cc54ff8b0881cf926cf1b23e6d59a943fb4d46c46357402		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 4856 bytes
font_01_sfnt_off0000f89f.bin
5486d8aa74f10fea5c143880d2152e9600fc2d6d0fddcbebb158b31ef9e1a405		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 11140 bytes

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