Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8cdad7e38006ac…

MALICIOUS

PDF

126.5 KB Created: 2021-03-30 19:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5444ae25dbd1255644f12c3254e20e5 SHA-1: 512cb4244ca377374d3fa81b7a5a67943d286072 SHA-256: 7d8cdad7e38006ac4126534062aaf297cd44ef15d35ba231f4b685db5e40e41e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=ipu+btech+result+pdf
    • http://nubolutlion.xyz/apc_back-ups_es_350_turn_off_beep8dhvn.pdf
    • https://lefaxujil.weebly.com/uploads/1/3/0/7/130739779/1607200.pdf
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/fojub_folakimumogo.pdf
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/2878711.pdf
    • http://nickned.me/10361764999m9wcs.pdf
    • http://uplrezina.site/minecraft_tu11_tutorial_world_downloadbbbjf.pdf
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/sexikekasebimole.pdf
    • http://feremujidonigu.getenjoyment.net/janodukipitisatipenuna.pdf
    • https://nojiwikimina.weebly.com/uploads/1/3/5/3/135315372/cf167a7e.pdf
    • http://lnstagramsupportinfo.com/wiruzesotomeruzolabotakt5cbd.pdf
    • http://mosovonetuvu.iblogger.org/56248613007.pdf
    • http://dream-stat.ru/hope_you_are_doing_well_and_enjoying_the_summerzslec.pdf
    • http://wivuperafuzo.mypressonline.com/vewasinuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/feborobegibew/reluzo.pdf
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_08e22d5816e545d98e3ffba6d8c0c1c3.pdf?index=true
    • https://s3.amazonaws.com/sabegokek/varusujag.pdf
    • http://turuduje.epizy.com/vimatutejumadoba.pdf
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_aa54ba40682f47f2b2b0bc78bcef9c6b.pdf?index=true
    • http://rexerutagid.epizy.com/79982472392.pdf
    • https://s3.amazonaws.com/veledabejufi/java_programming_practice_questions_and_answers.pdf
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_906265ed4f2a4e2792a133aa21c4359a.pdf?index=true
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_992a8f1b2a3243bc8bec172c9005760c.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_off00019ffc.bin
35edb65851d99a04222c9ff69953bf2f0ae3aaaf998b348591f6afd680f241e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19FFC 5108 bytes
font_01_sfnt_off0001b151.bin
dbe826f70aabfaaa598a02fab47ea3e101dc0d5c9b5e812928b9ab5fe55f1d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B151 10896 bytes
font_02_sfnt_off0001d673.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D673 16204 bytes

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