Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa561f31a486c5bd…

MALICIOUS

PDF

129.4 KB Created: 2021-03-17 09:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aa99e622b87a96ec274332a67d4189d SHA-1: d223f882bda33ac677707f983b686ffbfad85720 SHA-256: aa561f31a486c5bd2c1ad6af5724f396d20c20d6cda8ce62efe6ad5275dcb513
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on cloud storage services, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://vilenefex.ru/wix?keyword=great+gatsby+movie+questions+and+answers+quizlet', appears to be a lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=great+gatsby+movie+questions+and+answers+quizlet
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/7090269.pdf
    • https://nupanirosum.weebly.com/uploads/1/3/4/8/134858368/03043bb4c767a7.pdf
    • https://cdn-cms.f-static.net/uploads/4494140/normal_60128b9f06e72.pdf
    • https://cdn-cms.f-static.net/uploads/4471960/normal_6019a5889fd5b.pdf
    • https://cdn-cms.f-static.net/uploads/4409992/normal_6020a8d140b6a.pdf
    • http://kutatit.getenjoyment.net/what_powers_does_a_guardian_have.pdf
    • https://static.s123-cdn-static.com/uploads/4448094/normal_5ffcb040eec2b.pdf
    • https://cdn-cms.f-static.net/uploads/4402721/normal_602ea7a2ac239.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_9dd98c14dd7740dbaee43eee54aeeb28.pdf?index=true
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_c3113d4b17aa43e28a2deee9031b9c89.pdf?index=true
    • https://s3.amazonaws.com/vajefam/53663358909.pdf
    • https://s3.amazonaws.com/baposivarabuj/44477386072.pdf
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_bc4732dbf9364aa28bb2a79f65ec85f8.pdf?index=true
    • http://nuluwajewugutik.onlinewebshop.net/zumimabakokilagi.pdf
    • https://s3.amazonaws.com/lakadutof/witazisotoxilutiku.pdf
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_f0fefe4be6d84a61a0f3d4441eda1d19.pdf?index=true
    • https://s3.amazonaws.com/zategafozasiru/63774708146.pdf
    • https://s3.amazonaws.com/kagedatabujo/40901604404.pdf
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_931c0953d5e342dda25a984944041cef.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_50fffe24ebf148998bfbce3b3cafd5e7.pdf?index=true
    • http://jitawidavez.atwebpages.com/6143882224.pdf
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_b68b90ec3939436284911ce6bd1aaa85.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6e.bin
055c7ada1a55975508461eaff31ef9ba41476444923ad7bb7f4feca7c77a8519
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 68004 bytes
font_01_sfnt_off0001bb64.bin
9cdc083238c984d26d0fec77e54d757119a8c45ebc1ca95baa2e5d55ac9258f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB64 5744 bytes
font_02_sfnt_off0001cef4.bin
43618860592b029da3ce687011ba1516e7875400d0c5d7f6a6b38f2f8a64eebf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEF4 12020 bytes