Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef6bea3fc8862e4…

MALICIOUS

PDF

89.1 KB Created: 2021-03-24 11:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a3725bdca89573361634149913f2d16 SHA-1: dbb57b86922219ffa063e5f3a8ade27fc86b7c2b SHA-256: eef6bea3fc8862e47d0c9cebcd30ee5526e444789984df25c45b5446ec234e99
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on Weebly and CDN domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a precursor to a password-protected archive download, a common technique to evade gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/award?keyword=programa+para+unir+pdf+i+love
    • https://vusukiziroge.weebly.com/uploads/1/3/0/9/130969505/3976519.pdf
    • https://cdn.sqhk.co/nemazuwigumo/essLhdF/interpersonal_communication_skills_inventory.pdf
    • https://cdn.sqhk.co/bapulofuw/BieqPhg/gas_pump_card_reader.pdf
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/2738007.pdf
    • https://cdn.sqhk.co/bowewulaxam/6KihIgg/82115308470.pdf
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/461613a5b4b0a6a.pdf
    • https://cdn.sqhk.co/gusisitixinu/exhfKjh/a_planet_of_mine_achievements.pdf
    • https://cdn.sqhk.co/penuvipaw/iiKcJqX/rounded_corner_rectangle_mirror.pdf
    • https://nowesepi.weebly.com/uploads/1/3/1/1/131164229/zejolisufevokuxagu.pdf
    • https://cdn.sqhk.co/foxoxaze/Q7RidUq/83329172720.pdf
    • https://kibopomirisusi.weebly.com/uploads/1/3/2/7/132741064/ee0c3118a4f7.pdf
    • https://cdn.sqhk.co/bedazume/Jrjagig/71074530664.pdf
    • https://cdn.sqhk.co/keliziniw/c2u8igM/dudesixejit.pdf
    • https://cdn.sqhk.co/nivunufozub/chijXFz/pico_rivera_zip_code_walmart.pdf
    • https://cdn.sqhk.co/xekixuzurim/ajg2je2/kofofox.pdf
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/ad14702.pdf
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/5626727.pdf
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/1684290.pdf
    • https://kuvinobugo.weebly.com/uploads/1/3/1/3/131383931/rowuponijegefaj.pdf
    • https://cdn.sqhk.co/lexelinowe/6ja18do/kigotonirigesazegadin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e4f30448-7373-4322-94ec-3c07f3858590/what_does_horizontal_force_mean.pdf
    • https://uploads.strikinglycdn.com/files/467d42dd-a3c4-4c3b-a5b9-66850f51619e/30062273957.pdf
    • https://uploads.strikinglycdn.com/files/b5b81272-55e5-4615-be49-92137f092ab6/lazewuzajenelagoxuj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f980.bin
59469b3d4b7ca29c034c6e3afbe5d040b6b711a4258eee805771534b904195a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 5244 bytes
font_01_sfnt_off00010b42.bin
2e5e06f041b65c276e450601991a42b2d77745a8d8f8f6c05feea7b7ed43b0a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 5272 bytes
font_02_sfnt_off00011984.bin
d1229a683df602bf8e8ce7f767b42ab99a0b5a7dac3f9a36c74b197638d68c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 11664 bytes
font_03_sfnt_off00013fe3.bin
e7739f0d201e2c6fbecf9267b1b60e056fb80b6b501570008a81fd5f13790244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE3 16524 bytes

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