Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f126cd451d9ca2…

MALICIOUS

PDF

90.5 KB Created: 2021-03-21 10:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6978ffbb0ad3542f48e738062e5d457d SHA-1: d26e1f6f7e7e996fa490c672140274d855f7358e SHA-256: e9f126cd451d9ca204693235eb3ff78d341bffd2ba9a92a1f4654bbdb036abb9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=opera+mini+browser+for+android PDF link annotation
    • https://cdn.sqhk.co/xuzuvazol/l23gdia/4236614646.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/2cca9efe5.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/galozurejegapagid.pdfIn PDF document text
    • http://leledup.mypressonline.com/what_are_some_good_time_management_techniques.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/8d9f455d44537.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/Dhghhhi/cbse_class_8_social_science_notes.pdfIn PDF document text
    • https://sowubewakojanit.weebly.com/uploads/1/3/4/3/134348505/bivutedugovu.pdfIn PDF document text
    • https://lokawerimi.weebly.com/uploads/1/3/0/7/130776865/natux.pdfIn PDF document text
    • https://lesamasipedu.weebly.com/uploads/1/3/0/7/130739144/efdefc976.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/5750044.pdfIn PDF document text
    • http://gunofixe.medianewsonline.com/5004420528.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/dudoxikuluvagezofi.pdfIn PDF document text
    • http://timinome.getenjoyment.net/how_to_know_if_my_fitbit_flex_is_charging.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/gqf_sportsman_1502_incubator.pdfIn PDF document text
    • https://cdn.sqhk.co/lululitoj/KggYjgm/notes_notes_and_lists_for_windows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_06ae9933929a4760a672fd3e79adfb06.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_89ac0900c0654bd0a9edc14ad86b4e29.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_5436d939e6d848479adec9696bc5ae7f.pdf?index=trueIn PDF document text
    • http://dotopaku.atwebpages.com/widaxonaxag.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001289b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1289B 28004 bytes
SHA-256: f3b2a21296ff3b6a37aebd4986607a174058ef9c07c36c2ce83790b4e9e0c748
font_00_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 5412 bytes
SHA-256: caa6b28b1978061b59234f67f8cfae0dee3a6dbed8c4a1371c7c333a6d7b50ae
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 11144 bytes
SHA-256: 06ca37935e135b6ed5106e7f7bca21fe6c7efb558a673c4a3a568c5b84d76917

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