Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2143b9eba79b4bd…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 15:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c77df58aaa6abcf4e2fa57b99f6b883b SHA-1: 7d8705d92ee08dc62ac1ea7056d961d19fdc7277 SHA-256: f2143b9eba79b4bd6acea6eb6f9af798e42bd6838b080d5e550beb9c758b2b27
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to manipulate search engine results. It also contains an embedded URI pointing to 'maypoin.ru', which is likely a phishing or malicious content site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://maypoin.ru/award?keyword=inductive+and+deductive+approach+in+teaching+grammar+pdf
    • https://cdn-cms.f-static.net/uploads/4475874/normal_604f3d904484c.pdf
    • https://cdn-cms.f-static.net/uploads/4468534/normal_600a257095169.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/xivepimef.pdf
    • https://static.s123-cdn-static.com/uploads/4415937/normal_5ff5ccc41d311.pdf
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/5826cb973.pdf
    • https://cdn-cms.f-static.net/uploads/4413109/normal_604bc3d519ec6.pdf
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/bidagotekuzejunulodo.pdf
    • https://xijogokamu.weebly.com/uploads/1/3/4/7/134721509/dixuparob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e7fc8388-e25d-49ca-b7e5-76431fa4f506/serge_lang_linear_algebra_3rd_edition_springer.pdf
    • https://uploads.strikinglycdn.com/files/09f9347a-949e-479e-8e08-077c9b3571bf/nenitatepitozujatevojop.pdf
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_05173e2ae75549cb96368894a714baab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/65d95b01-9b78-4970-a9b3-e118792a29ac/english_test_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/1ced7074-8d19-44f3-9c30-8b23bee2796a/30691263381.pdf
    • https://uploads.strikinglycdn.com/files/8339a3b7-7ca7-4d98-ab4e-d6f0fdc06da9/fear_and_loathing_on_the_campaign_trail_quotes.pdf
    • https://uploads.strikinglycdn.com/files/95a7e783-85b4-4e7d-ae8d-8b7dbcedd93c/colonial_of_zeeland_grandfather_clock.pdf
    • https://uploads.strikinglycdn.com/files/12aa89fd-8643-48d4-81f2-5bc616fbc151/76511720559.pdf
    • https://uploads.strikinglycdn.com/files/3cdc1009-7c11-4731-9ee0-eabab7d24480/mapimedogiwimewevilo.pdf
    • https://s3.amazonaws.com/limepusotanal/boxing_gloves_size_guide_oz.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_c5f733d708794cf49e658771647cbd2d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/97c5dc11-55cc-4a5c-b794-9e6b5569ed20/93316382780.pdf
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_80bcf14496664d5f8fec283fb47c27ca.pdf?index=true
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_47815d1983824cc2865212912ef11e33.pdf?index=true
    • https://s3.amazonaws.com/gogunabones/structural_features_of_an_information_report.pdf
    • https://s3.amazonaws.com/xalasawu/99778080697.pdf
    • https://s3.amazonaws.com/zukogi/don_t_starve_together_sanity_guide.pdf
    • https://s3.amazonaws.com/xapidajovaji/jolujesilur.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f730.bin
19a07ed2825a3b90ed21ce8cce68c32ee037ff55db53a167e6752adc14bbd33c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 5356 bytes
font_01_sfnt_off0001094e.bin
20af161e0baf21b6ef82f5cf1f2a521a5b230acebc2b74fb6815c96c8debad48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 10836 bytes

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