Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd93412e333cc78…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 07:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa947e1b65f57afb1367d954b4508dd1 SHA-1: 2888f8e506b9abb6c258e1cd5208d478881e5462 SHA-256: edd93412e333cc78b1d3b253aed31715b2113c4771d4e1c6bbea7e6b822d0429
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'cnc plans' and metadata indicating it was generated by wkhtmltopdf, a tool often used to create documents for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=wooden+surfboard+cnc+plans
    • http://koprovk.xyz/112243030545bpps.pdf
    • http://vengriya.space/31231402829sh3a8.pdf
    • https://nufujemirifo.weebly.com/uploads/1/3/4/8/134868255/8267453.pdf
    • https://sovivagigeb.weebly.com/uploads/1/3/5/2/135296454/zituxugejivapibogup.pdf
    • http://wovuwukotuvoxi.mygamesonline.org/small_split_free.pdf
    • http://mxbur.fun/cie_chromaticity_diagramnopi9.pdf
    • https://cdn.sqhk.co/bovokolel/ay5ghjb/zezutimitesetuparudamiv.pdf
    • http://wigosixozem.mywebcommunity.org/63950808822.pdf
    • http://pidagenavuziw.mywebcommunity.org/bazagepazan.pdf
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/9574926eb7273.pdf
    • https://cdn.sqhk.co/zuronenom/dcr2jdm/rpg_for_destiny_mod_apk_games.pdf
    • http://wamipivifubape.sportsontheweb.net/how_to_clean_big_boss_air_fryer.pdf
    • https://cdn.sqhk.co/duwenaxiseve/giJRFxi/sensory_integration_theory.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_70b3a04b6edc465d8ac29953cdd02968.pdf?index=true
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_f18bdb6d31ed4d6d95e1a19510eb7e88.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c9e8e31f-9589-4ba8-895e-335e46944567/86497542436.pdf
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_b57fbd311de245429fd40cd34630aa3d.pdf?index=true
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_88b001b8bc7a4865a2cb581a1607fdff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8eaf061a-ae4a-4631-912e-5eb7ad420a5b/lg_inverter_direct_drive_washer_top_load_smart_drum.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_35e77fcb0690459d811a514afb71a704.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ffc60383-2509-448a-9cc8-cd46da59538e/telumigosal.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_off0000f309.bin
96d02ad0c4cd471ca3f7f3d87241f480bd4c9c7b13d6ac121341c01a5e04d154		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 5300 bytes
font_01_sfnt_off00010529.bin
933bda98f9cbb0e0a72c063d433f2ab97b09d09e2c21d20b62bee9c99665e8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 10500 bytes

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