Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae419dc69630571f…

MALICIOUS

PDF

82.4 KB Created: 2021-03-21 05:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cd4448eb0f0a4849a9f8e534ee68c96 SHA-1: 91c6dc87d8daebf875a15c82211d1b697a8ac8cf SHA-256: ae419dc69630571f6ffcafffa2a5a1bb508cc61dd6eb59e199dfaead8860465f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one pointing to a suspicious domain ('soxebez.ru') that is likely part of a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of many external links, some pointing to benign PDFs and others to unknown domains, suggests a link farm or redirection mechanism designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=radical+word+problems+worksheet
    • http://newoxoxi.mywebcommunity.org/13949336280.pdf
    • http://vedibekupuviru.iblogger.org/76555614038.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fajazimigig.atwebpages.com/31315386716.pdf
    • https://s3.amazonaws.com/godoremitiwuja/macbeth_act_4_questions_and_answers.pdf
    • http://jabelakejirer.epizy.com/60236614864.pdf
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_a588d5566a1f4ee4976fdee8123da5a0.pdf?index=true
    • https://s3.amazonaws.com/pegebunov/wuguxub.pdf
    • https://s3.amazonaws.com/kukazowox/fikejeworobotiwen.pdf
    • http://lojogijenijuf.epizy.com/bryant_plus_90_furnace_price.pdf
    • http://tovujopojat.epizy.com/7262234610.pdf
    • http://lamafuravufezin.epizy.com/rogufewibitixuw.pdf
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_973bb87d5850405b828161455b438298.pdf?index=true
    • http://jexeboxemu.rf.gd/40463831814.pdf
    • https://s3.amazonaws.com/nisiwanolom/71643187059.pdf
    • https://s3.amazonaws.com/belapawerezuju/hp_8000_elite_release_date.pdf
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_220abef2cb0e43b88443b108db54ef09.pdf?index=true
    • https://s3.amazonaws.com/sizadagazagaj/1582672224.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_off0000ec7a.bin
976c6ff421364f5015805075e21b140b92b6234bcf365268b7cfc547c31980be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 5616 bytes
font_01_sfnt_off0000ff74.bin
55cc6fdf575b5a6206ca66dcb3f6e3fef75f1ecc3a88308092447b81ba9d2530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 11600 bytes
font_02_sfnt_off00012725.bin
b1345b03cb8ff90cb42c7c8f61cc0a97610ec8082568e26930ee59dd54284444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16236 bytes

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