Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f64a77fcacb1c20…

MALICIOUS

PDF

95.0 KB Created: 2021-04-02 00:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c25a201ce397feef8a612323651139b7 SHA-1: 820c3fc1d9aa4562f6ba6614729ff2d04d0a83b6 SHA-256: 7f64a77fcacb1c2076f7692a7def43bc251ac22af283033c9e54cd4cb0feabe8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous embedded URLs, with a critical heuristic identifying a mass external PDF link farm. The document body, though heavily obfuscated, suggests a lure related to a "Brewmaster essence guide", likely intended to drive traffic to malicious sites or download further payloads.

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://nipisod.ru/123?utm_term=brewmaster+essence+guide
    • http://khanapoorti.com/ziperezuxpdb5.pdf
    • http://qwertyujg.xyz/hp_officejet_5740_manual_espaoldz8xk.pdf
    • https://tugoxovelosiju.weebly.com/uploads/1/3/0/9/130969774/sisuf_kowexesuluweta_fimabizo_damujusoxona.pdf
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/potigojoxudex.pdf
    • https://nemoderi.weebly.com/uploads/1/3/2/3/132302766/4673638.pdf
    • https://xelixexojiga.weebly.com/uploads/1/3/4/1/134108676/8580036.pdf
    • http://jonavaruxeri.22web.org/10522135246.pdf
    • http://alifan.store/19500144900c9eo4.pdf
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/jarum.pdf
    • http://igcopyrightverify.com/20561948528cyub.pdf
    • http://carinsusa.com/mamonarugu057ij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kovezux/29436292278.pdf
    • https://uploads.strikinglycdn.com/files/c3f15fba-ccaf-4e1c-a2b8-07c14950451d/twilight_new_moon_movie_download_in_tamil_isaimini.pdf
    • https://s3.amazonaws.com/gurafoga/whirlpool_will_not_spin_or_drain.pdf
    • http://jefeduwikiw.epizy.com/is_my_samsung_tv_120hz.pdf
    • http://naremijex.epizy.com/oxford_thesaurus_dictionary_free_download.pdf
    • https://uploads.strikinglycdn.com/files/fc6907d7-bc84-4f8f-9624-1d3ddedb55b3/xokuwizafokesefumatesa.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_off00011ec6.bin
fc4f3c2bcd23797ea92d882879d91b9a079270d9b8f143707ecc67f599cc9f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 5368 bytes
font_01_sfnt_off00013100.bin
4ad93682219ba94e24b69941a152b729c336c35261c930c8c0a7a928e26b9a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 11928 bytes
font_02_sfnt_off000159d5.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159D5 16096 bytes

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