Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb5dd388c38219c…

MALICIOUS

PDF

76.1 KB Created: 2021-04-06 11:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12e423d10269beb3f481fcd82f5fb158 SHA-1: ad5eca5936c189ea4aa0bbe661821da418ed5dab SHA-256: 0cb5dd388c38219c7a0108ea2b9297423f0650618d64adff2c40882c3f2d513b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites.

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-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://midufefew.ru/award?keyword=lp+bronkopneumonia+2020+pdf
    • http://alphabitx.com/runescape_fastest_99_fletching_guideo1p31.pdf
    • https://kujivorel.weebly.com/uploads/1/3/0/7/130776875/682164.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://farvestnn.ru/fetijutubonasunuxekegawdmvu.pdf
    • http://soinjaga.ru/291415191684c6sb.pdf
    • http://bcpzon4segurabetaviabcp.com/sobosijadavujunugonobezns8d.pdf
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/xoligapatuvumar-womosebanegotaj-zokonawuwisugi.pdf
    • https://sejuxotanodefif.weebly.com/uploads/1/3/5/9/135957191/feba2ff3480.pdf
    • https://kofitabalu.weebly.com/uploads/1/3/0/7/130775223/6959977.pdf
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/eb1ab38f6.pdf
    • http://masalev.ru/ddp_yoga_free_workoutzct0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_44f506fbab76468ea2100864f1d88bd9.pdf?index=true
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_65d9411f28ef4e978cee9e8b101428e7.pdf?index=true
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_be9980f1cb764361a51e6adf19b0122f.pdf?index=true
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_8c4a42863d024b5ca35ca3cb8db1a43f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae953802-c3a6-4271-bb58-80236c00d97a/277725838.pdf
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_19e73982820641b189cc873dcb11d978.pdf?index=true
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_4cdd71e563254cc7b944979ed1cf8bf1.pdf?index=true
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_c5f961c5760f41cf8d78238c97cbfeb1.pdf?index=true
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_c192e035ae29421592adfd3de9a67abb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2159bb77-678b-419f-b2e3-d62b40d58ae2/kezia_noble_books_download.pdf
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_560fefe7c2cd40babc05ce37f74111cf.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_off0000eb78.bin
e53d44ca5d78f071b790b1f13f44e1f7b34f903737cd8bcd674ce4ef5a7b4bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 5396 bytes
font_01_sfnt_off0000fdb8.bin
f6fc083553ee5e980cb002738307f1c5820045545e55e704ad69be9ada3cc1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 10956 bytes

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