Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db0811d2bc9757f…

MALICIOUS

PDF

84.7 KB Created: 2021-04-15 13:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5fff2279c2eeab3256bc48a9086dfa7 SHA-1: 2a6a1515aec4228390287bbd6528f5df4df75a97 SHA-256: 6db0811d2bc9757fb8359b86ef66c6cee39d3f4cb9b22c544dc53a5e1285a6bc
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 disguised as document downloads, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=dungeons+and+dragons+cartoon+final+episode
    • http://gewewenaso.iblogger.org/40th_bcs_result_download.pdf
    • https://cdn.sqhk.co/rizuwevize/ghgRLih/42714288579.pdf
    • https://cdn.sqhk.co/lutidofele/cijtjgd/jurnal_rheumatoid_arthritis_adalah.pdf
    • https://sigiduba.weebly.com/uploads/1/3/1/3/131384121/tuverepefezumolexog.pdf
    • http://bewewafip.scienceontheweb.net/which_kitchenaid_is_better.pdf
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/12094.pdf
    • http://goladelexugezi.sportsontheweb.net/36976357542.pdf
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/1493401.pdf
    • https://cdn.sqhk.co/kubabulukod/0jjbhbV/vubisefozuwilanakigejok.pdf
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdf
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/fasivusek-vutik-jexejerobi.pdf
    • http://boketizabujig.scienceontheweb.net/64853534675.pdf
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/vukaxagavol-nemakebojimu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_eae48187363b4277aad801fec7510ecb.pdf?index=true
    • http://zogadawedalifap.onlinewebshop.net/how_to_connect_bluetooth_keyboard_and_mouse_to_imac.pdf
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_73930e07f5c143918e4c3bdd21653137.pdf?index=true
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_cba197371b0b4a3e80e00fde2f16b1d1.pdf?index=true
    • http://romofimor.onlinewebshop.net/xilifam.pdf
    • http://zulojijokonox.rf.gd/electrical_cable_lugs_types.pdf
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_7539943f2ffc4d6186d3f28dfabd24b0.pdf?index=true
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_5efc98bb2e1d499e9760d33853e64c79.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_off0000f39a.bin
689a6372104afa1f973f3d9bf0c766d95793539cfad6525eb5840d8bf11b60c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 5320 bytes
font_01_sfnt_off000105d2.bin
acc2f5351271891fb18ec78cc2d7614692327ed1886e70fd41c4e1beab7e17b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 12492 bytes
font_02_sfnt_off00012f4d.bin
bc7e3f6831be34686de02ce7be2a06b9f1fa2b1a298201cd6e3dc3baf4672bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 16376 bytes

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