Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa67c01644a9888…

MALICIOUS

PDF

79.3 KB Created: 2021-03-12 17:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a3b12c1651dec42e14acb4dc9b1023f SHA-1: 1277d9484224fa886a59fe02ccd96048b9834fe3 SHA-256: cfa67c01644a9888a8d3fe89607fb0a5ec5b44c4a21cb8aa234244a0fb0d051e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://jacksth.ru/wix?keyword=morgan+stevens+actor', suggests a potential lure or phishing attempt. While no scripts were extracted, the structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=morgan+stevens+actor
    • https://lukawonudos.weebly.com/uploads/1/3/5/3/135320707/ca959206.pdf
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/kobawazed-waxulikipu-jonugiba.pdf
    • https://venewosusi.weebly.com/uploads/1/3/1/3/131398385/5673385.pdf
    • http://nokigafapo.22web.org/xirutivolepomorumigumason.pdf
    • http://bilapak.66ghz.com/pukozusorebeporasor.pdf
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/9303738.pdf
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/6222195.pdf
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/siwipubuxosuvelu.pdf
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/02ea829551192f.pdf
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/bapenukepaz-nururuxig-sutonowifodeje-sakosamijaro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bofofopefolag.epizy.com/best_dd_5e_dm_screen.pdf
    • https://s3.amazonaws.com/bajapovogam/icse_board_date_sheet_2019.pdf
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_95348eb6b75c4666a54b9abfa697b3b5.pdf?index=true
    • http://puteruwegadijem.epizy.com/new_horror_movies_english.pdf
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_b6b16d76b61b4f3c9fcc9eb09efd1ae9.pdf?index=true
    • http://sojugixu.epizy.com/robber_bob_hack.pdf
    • http://besuwodusibix.rf.gd/nofozelijuteminowuf.pdf
    • https://s3.amazonaws.com/bisapovepizaj/redanaf.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_off0000fbca.bin
09d4dd6205824ac8343c7c2e52b69d6393438f6c27f6ebe82615c5dcd5401d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 5000 bytes
font_01_sfnt_off00010cf3.bin
5817171d99c5fb73bbf13138f89c5debecf178ae870bfcfb1cfebff417f37af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 10340 bytes

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