Malicious PDF — malware analysis report

Static analysis result for SHA-256 b573c191ffde23e3…

MALICIOUS

PDF

89.3 KB Created: 2021-04-06 00:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8429cc3421499e69384ee0c9eabb79b SHA-1: d47c5063cf0039d250dc50cced2a285a5e249e10 SHA-256: b573c191ffde23e30bc33a0f8ba2f2d7edbbefa5590a5ea3ce6ba53eb32dcc68
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one suspicious URL pointing to a potential phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/wix?keyword=charges+of+ions+worksheet
    • http://techanomic.com/among_us_always_imposter_mod_apk_mobile18q0i.pdf
    • http://dadujez.22web.org/rojajixometumatukevexumot.pdf
    • http://dazopodupikud.22web.org/bepofugozip.pdf
    • http://masajsalonunuz.com/23760417538sg7uo.pdf
    • http://ryukzak.digital/41168312211m3pfw.pdf
    • http://myfoxing.online/38225405092bwzr0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_f57509312d804942a2cd736d9d685f5e.pdf?index=true
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_b5717ede0cf94b01bd4222db598c6bd5.pdf?index=true
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_491f104f9f3a45ee81249506fac6a7bb.pdf?index=true
    • http://rogofijanititad.epizy.com/47916519303.pdf
    • http://gonojelovemu.epizy.com/short_story_definition_by_edgar_allan_poe.pdf
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_f3c814fd25e142c0a8269c0b9ed5eb31.pdf?index=true
    • https://s3.amazonaws.com/wutezigojuxi/6209407784.pdf
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_bbe9b6b8881b44f18ebcc04af147c24a.pdf?index=true
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_87b8218f702646d293f2e1337faf3160.pdf?index=true
    • http://mufifofoge.epizy.com/rulunexum.pdf
    • https://s3.amazonaws.com/rizezobabub/99988793945.pdf
    • https://s3.amazonaws.com/jobavo/autism_puzzle_piece_template.pdf
    • https://s3.amazonaws.com/xukonakefules/bilirutipa.pdf
    • http://buvinisupolo.rf.gd/renum.pdf
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_542a83bfe0e6450da0275b32e1ff9208.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd3.bin
2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 6440 bytes
font_01_sfnt_off00010bc8.bin
7fbc43a03432158b427e63c1da63e11153211ff08b4b60501c34d92928e07054		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 5056 bytes
font_02_sfnt_off00011d0a.bin
4fe7a667c5571e7b61371b90cf6736004047d78f611c9c50d3bdf5c93cbb7747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 10832 bytes
font_03_sfnt_off00014260.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14260 16092 bytes

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