Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7bc3c5086bba85…

MALICIOUS

PDF

72.9 KB Created: 2021-03-22 21:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9370852ea28ff24af895a079d4a43041 SHA-1: a9274d3cc43e7da22e9047c7cc365ad893ac6e99 SHA-256: ef7bc3c5086bba858c378227f002da119b6b97e4cf1304fb39ad261ba8f00aba
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to `midufefew.ru`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` suggests the PDF is designed to host many links on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of embedded URLs and the overall detection suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://midufefew.ru/123?utm_term=alanganallur+jallikattu+mp4+video
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fedb3e2c1aef.pdf
    • https://static.s123-cdn-static.com/uploads/4419204/normal_5fff965bbc489.pdf
    • https://cdn-cms.f-static.net/uploads/4419654/normal_601d260ba8183.pdf
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/e03d17e850.pdf
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/domamix.pdf
    • https://cdn-cms.f-static.net/uploads/4454556/normal_602ac699d5c51.pdf
    • https://cdn-cms.f-static.net/uploads/4387046/normal_602c25857c970.pdf
    • https://ridulajevu.weebly.com/uploads/1/3/4/3/134352946/4366982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://ziwemasux.myartsonline.com/83634655429.pdf
    • http://ximawefab.epizy.com/is_siberia_the_coldest_place_on_earth.pdf
    • http://gigixago.epizy.com/wudorabuvovewafoku.pdf
    • http://zowofiz.myartsonline.com/siras.pdf
    • https://uploads.strikinglycdn.com/files/134672f7-3777-43cc-8599-5e7e8aa4233e/what_is_a_good_knot_for_braided_fishing_line.pdf
    • https://uploads.strikinglycdn.com/files/3b15300e-ecc3-4504-8564-991ecbd112e8/why_does_my_rca_projector_keep_turning_off.pdf
    • http://ramejepazino.rf.gd/handwriting_worksheets_for_1st_class.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c842.bin
e2a6837b945342565df7ff87c783900a22cc7fe1a5ff09eadf74685b540b8602		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC842 5376 bytes
font_01_sfnt_off0000da8a.bin
2a20a1343eb9cdc3db8b3653d99f4ed2c237ced654c8f634ca4452965db444ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 9056 bytes
font_02_sfnt_off0000f34b.bin
43e0ab019d9abfb7d944a35c6ccfeaf15e25a77427b9bdf0e12ad4b9a3aefa71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 9752 bytes

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