Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d23ababdecb32d5…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 18:26:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15a67c503d089f99d34efa57a38c3e96 SHA-1: 26987a7240da943ac6ddd874a76bb3cbbffe2298 SHA-256: 6d23ababdecb32d5bcf54afb4108170ceca9f0af1f9841129d1578d90e0511f7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, with a primary URL related to 'worksheet answers'. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing trojan. While no scripts were extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

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://nipisod.ru/wix?keyword=rationalize+the+denominator+worksheet+answers
    • http://buytoday.cc/vuzikabalegakaxoli3acay.pdf
    • http://alkostore.xyz/20136679919hfwe2.pdf
    • https://fukoroxovelamos.weebly.com/uploads/1/3/0/7/130776486/9564628.pdf
    • https://detiloxobaz.weebly.com/uploads/1/3/1/3/131398171/7f7988a.pdf
    • https://fijuzezakuxulow.weebly.com/uploads/1/3/5/3/135391315/3462681.pdf
    • http://pedaropira.22web.org/vigejawagumumu.pdf
    • https://cdn-cms.f-static.net/uploads/4466664/normal_6045e8069b7d1.pdf
    • https://tajizaruf.weebly.com/uploads/1/3/0/8/130813694/kirepekapaxale.pdf
    • https://cdn-cms.f-static.net/uploads/4490720/normal_6015e85273b46.pdf
    • http://mijogunabisojil.iblogger.org/19622127944.pdf
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/73bbf921b3.pdf
    • https://cdn-cms.f-static.net/uploads/4455642/normal_600d4ce6a5a28.pdf
    • http://lovasosirukes.iblogger.org/bushnell_tour_v2_owners_manual.pdf
    • http://e-devletturkiyeaidatsistemimgovtr.com/7294726615d2lqv.pdf
    • http://tronreserve.online/deborozokurunopesemide1ewn9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_351ee0c2d5bc4500bae80095492e40ac.pdf?index=true
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_fe2cad487d174e08b5103fa668ff785a.pdf?index=true
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_90ce884cbb40403b81e7dcfac29d0bcd.pdf?index=true
    • https://a1caaca2-2281-43ca-b2b5-e8dcf6f2a4ec.filesusr.com/ugd/c6e36d_31318ac9bf1545a68faa8dff7b9740d4.pdf?index=true
    • http://wafijolosa.epizy.com/functional_groups_practice.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_off0000e19e.bin
7fd11a90d474879f4b91e55813cf8b680d3b7304005d63f404ea3b115c882380		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 5280 bytes
font_01_sfnt_off0000f37a.bin
f8b1f5f01810361ebbaacdefc420b3876120f3f595bfc774d336441a4a140c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10624 bytes
font_02_sfnt_off00011832.bin
2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 16060 bytes

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