Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68b8fb6732f91e0…

MALICIOUS

PDF

69.7 KB Created: 2021-06-12 17:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29878dd366ef3fc77f18a6ee1b950a64 SHA-1: 75746514c717ccf6e67545d2563473f731b4c566 SHA-256: c68b8fb6732f91e00bd9a42255851f4c084ed66b2b8e86e3d181ca100cf36a19
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a large number of external PDF links, suggesting a link farm. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The embedded URLs point to potentially malicious or SEO-abusive sites, indicating an attempt to redirect users to external resources.

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://krisoc.ru/pbw?utm_term=edpi+calculator+csgo
    • https://cdn-cms.f-static.net/uploads/4495240/normal_603a9c6d96a17.pdf
    • https://xiwajobuxeke.weebly.com/uploads/1/3/4/6/134637113/sebeduwijabaxof.pdf
    • https://jozugirizozixus.weebly.com/uploads/1/3/2/3/132303278/7096b467a386.pdf
    • https://static.s123-cdn-static.com/uploads/4426696/normal_600011b70ea17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://giribuv.pbworks.com/w/file/fetch/144541518/94964101413.pdf
    • https://uploads.strikinglycdn.com/files/ff28d7c4-e0fd-4dbe-9736-91817dfffe2b/48670442796.pdf
    • https://uploads.strikinglycdn.com/files/403a8392-416c-443f-8e59-8b61dec61a22/fubuwanudiwatoxa.pdf
    • https://uploads.strikinglycdn.com/files/6e13673a-6894-4d50-ac19-b9a93265431f/73323391868.pdf
    • http://wuvebag.pbworks.com/f/god_of_war_psp_rom_download.pdf
    • http://betikox.pbworks.com/f/android_stuck_in_airplane_mode.pdf
    • https://uploads.strikinglycdn.com/files/10b953e6-98b7-4d6f-8e23-f99e4cb7e108/why_isnt_my_gas_stove_heating_up.pdf
    • https://uploads.strikinglycdn.com/files/44f4ecb7-77f1-49bb-b15e-2cbbd5ee0a1d/vobuzegilelokazomiwi.pdf
    • https://uploads.strikinglycdn.com/files/f2cdf0ea-6cfe-4d60-8acc-64408db4e046/buvusimigalokodumivelutoz.pdf
    • https://uploads.strikinglycdn.com/files/8f3b91cf-b679-40f9-93e0-4aa25ecb25e9/the_childrens_hour_act_1_summary.pdf
    • https://uploads.strikinglycdn.com/files/48ceed2f-4e1c-4084-a57b-0bf4c28945db/tanu_weds_manu_returns_full_movie_free_download_720p.pdf
    • https://uploads.strikinglycdn.com/files/5f5e7a84-311d-441a-8517-3f615a42b73a/sun_joe_pressure_washer_spx2599_manual.pdf
    • http://wexagiz.pbworks.com/w/file/fetch/145063668/darogulavenedozudazivewij.pdf
    • http://raravisu.pbworks.com/f/91604355202.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_off0000d36f.bin
4cfb07772bd6ee74d80ef9b1e8a7fdd17cae2a886a74a471b2c5d10f8d57f97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 5200 bytes
font_01_sfnt_off0000e530.bin
1bac189855efcf7d048b61c8777ccf0b86091c1785237e63b95efe2e6998750e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 10916 bytes

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