Malicious PDF — malware analysis report

Static analysis result for SHA-256 242fa8275bfd587e…

MALICIOUS

PDF

113.7 KB Created: 2021-04-03 14:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49a10190aab96d5464261fef71a1f162 SHA-1: e707d57158930cbccefc9be94037f29ef17a1fd3 SHA-256: 242fa8275bfd587e22ee36fe507bdc604c223f57a1cf263537858b4fd4b1df5b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or phishing lure. The primary malicious URL identified is 'https://resalured.ru/123?utm_term=rudram+chamakam+in+kannada+pdf', which is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/123?utm_term=rudram+chamakam+in+kannada+pdf
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/zazufurox.pdf
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/2203635.pdf
    • http://trysoda.pro/tarelula6lfa7.pdf
    • http://antonioit.space/very_sad_life_quotes_images_free_downloadkxuy4.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/06d03241-9174-467d-ae16-184096149cbc/bissell_proheat_power_steamer_manual.pdf
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_758aeb37d2be4d9b89b94c243a492144.pdf?index=true
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_6de0955ee59745ebad6f83e79b6530b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/60bae5c7-d773-422d-b8d4-5ff82394f2d9/nme_500_greatest_songs_of_all_time_500-401.pdf
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_cc6b426348b349338ad440e7ed235493.pdf?index=true
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_631556b3ef0b472d85de4b22dfc72641.pdf?index=true
    • https://uploads.strikinglycdn.com/files/014cc1f9-dfbf-4d1a-8933-a46d637ed815/xexibexokemo.pdf
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_3ec5d78c2d87415db84ab0222a572890.pdf?index=true
    • https://uploads.strikinglycdn.com/files/68492e54-5a7f-47eb-b0be-4e2c1279541b/how_much_do_security_engineers_make.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_bbac4b0b5a204a3880fe6131e19d77ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4a900c2a-d91f-440f-9d14-e48ba4726807/vativezonijumujorak.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_c7bcd49230934bedbddafd4470af2bec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4e8d7e8e-abdd-4b57-83bb-975020394269/how_to_write_a_screenplay_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/0ea2ee54-366d-412b-bac5-a97b9c5a187c/80373861950.pdf
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_8c2fa1f8a87d4bb0ba5c5e372e1af251.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014884.bin
4f115886b48ed4f4373e8829811cd91b2e0d7fdd91885c6d211770f3fd429a65		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14884 46052 bytes
font_00_sfnt_off00012d55.bin
e5475b716867b3f33c7a1772fc19ea775de07be0b2f9c0168292d214592c9e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 5256 bytes
font_01_sfnt_off00013f12.bin
f46e6372de50a2cbde1f8bdabbbab189751cb3bd88e87a1552b81ba7dbba52c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F12 2140 bytes
font_03_sfnt_off0001946e.bin
7fb5638bd44cdf844f4e14f6d0ce01b61b9d9959c08c1e621b401bdac7bf1dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1946E 9936 bytes

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