Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d242817ed1c78d…

MALICIOUS

PDF

116.0 KB Created: 2021-04-24 23:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c95b3c9b180ce778013aa1da2511db75 SHA-1: 6ba7969b4a123a0b67797f10d6f0aee1a83d2310 SHA-256: a0d242817ed1c78ddcd37c53751fa0a2e4cd41eb193cdabaf8297b41493133c7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://seumenha.ru/strik?utm_term=husqvarna+zero+turn+rz4623+drive+belt+replacement', suggests a lure related to search engine optimization or potentially a phishing attempt disguised as relevant content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the extensive linking pattern is indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=husqvarna+zero+turn+rz4623+drive+belt+replacement
    • https://cdn-cms.f-static.net/uploads/4387421/normal_606d4207d4946.pdf
    • https://wutusubefesuw.weebly.com/uploads/1/3/5/9/135961291/6311192.pdf
    • https://ketafimevudo.weebly.com/uploads/1/3/1/6/131637081/5738441.pdf
    • https://static.s123-cdn-static.com/uploads/4403561/normal_6004b8661751e.pdf
    • https://static.s123-cdn-static.com/uploads/4460251/normal_5ff19abd14be1.pdf
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/4879239.pdf
    • http://jajeredax.22web.org/28055089071.pdf
    • https://rizapomon.weebly.com/uploads/1/3/0/7/130739727/6e324823b7911de.pdf
    • https://cdn-cms.f-static.net/uploads/4404113/normal_6060c6769395a.pdf
    • https://static.s123-cdn-static.com/uploads/4385620/normal_60059fc14e5d7.pdf
    • https://nenusisuma.weebly.com/uploads/1/3/1/6/131606583/8687601.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_d65e3cb8e0b542db9aee965a52fc1b71.pdf?index=true
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_eb826255dd0e46c98e59e06b07e1a56d.pdf?index=true
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_e2c328545b6a4e609e6a1efb15f6701f.pdf?index=true
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_e25e42e0790640318fc2556e4db83613.pdf?index=true
    • http://nabukewegurizev.rf.gd/luxury_bed_sheets_nz.pdf
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_486e2adcb7a34a44815cb68ee236fbf8.pdf?index=true
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_30370bdeb96e4731b8063253a210e2eb.pdf?index=true
    • http://xanawuvogi.epizy.com/amortized_analysis_in_daa.pdf
    • http://fipotunisobojow.epizy.com/songs_from_blessed_and_cursed.pdf
    • http://notavos.rf.gd/how_to_write_a_narrative_essay_grade_6.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_cc0b6a512d53428ab322ca637ba87cb7.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
    • 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_off0001707d.bin
f177bd1892ce0fced1019368f50b1c84b4b95c7711770d2c741d0e6a54a66260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1707D 6096 bytes
font_01_sfnt_off0001852e.bin
8eed7d64c2d68b0bbf8d0de6389ae9c5882bdd4e8a62059988535c64e25846b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1852E 11400 bytes
font_02_sfnt_off0001abfa.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABFA 16204 bytes

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