Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcc7edd6fa7af32…

MALICIOUS

PDF

74.7 KB Created: 2021-04-01 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06c136b66278050c50154fc496bbab3a SHA-1: 90284263e4639110180ebd6857faf24c562b2c0c SHA-256: dbcc7edd6fa7af326993625fc37061015809d652ec71a3526768ff0e4bd4350b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with one prominent URL pointing to 'mezovuduw.ru', suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to 'worksheet answers', a common social engineering tactic to disguise malicious intent. The presence of embedded JavaScript, though not explicitly detailed in the provided heuristics, is a common vector for malicious PDFs.

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://mezovuduw.ru/wix?keyword=1.5+angle+pairs+worksheet+answers
    • https://cdn.sqhk.co/logubaxe/jiGurgi/20522922493.pdf
    • https://cdn.sqhk.co/pugalaleluti/eghJA3j/algebra_1_final_review_worksheets.pdf
    • https://cdn.sqhk.co/jeforije/J04Rsjg/38447782933.pdf
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/papomaginumikuxasewa.pdf
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/vaforuji.pdf
    • http://sedouche.xyz/93154047345r0z3l.pdf
    • http://profmaster74.ru/patigosafemudura719i7.pdf
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/vagulifab_matitidefop.pdf
    • https://cdn.sqhk.co/kumotuxijufu/LmTegjn/moomoo._io_official_pikes._io_brutal_squad.pdf
    • http://idealslimitalia-oficial.site/how_to_stop_freezer_alarm1calf.pdf
    • https://cdn.sqhk.co/mogowepuw/erhcheX/zx_house_attack.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fidobakipivogit/sesowezesib.pdf
    • https://s3.amazonaws.com/rorives/reading_comprehension_grade_4_worksheets_free.pdf
    • https://s3.amazonaws.com/lopadivupudexa/letter_format_in_marathi_2019.pdf
    • https://s3.amazonaws.com/sazariwapa/18828909469.pdf
    • https://s3.amazonaws.com/bejexe/vorowamafegiberuzik.pdf
    • https://s3.amazonaws.com/baritexovopa/8159287024.pdf
    • https://s3.amazonaws.com/mefadedosuw/68768763655.pdf
    • https://s3.amazonaws.com/tiluwisulepam/jegixo.pdf
    • https://s3.amazonaws.com/davawina/the_serpents_shadow_book_report.pdf
    • https://s3.amazonaws.com/waduzirader/xubepomajadojaragiwig.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee7.bin
9e58f282bcbfd35db0c7ca2a7b3081ce3b64dc40c6265ef8b7ea8741e3d4dc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 5348 bytes
font_01_sfnt_off0000e135.bin
5b65b6b7f483707cdc62c60b41d95410eb039f47d1996cf9bfc86ef5e221cec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 10780 bytes
font_02_sfnt_off0001063a.bin
89568fb0e543fe76a610fbfbac23dae1f72f5dbd50aaad1b1d539db581ebe46a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16192 bytes

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