Malicious PDF — malware analysis report

Static analysis result for SHA-256 52783785b817d7fd…

MALICIOUS

PDF

74.2 KB Created: 2021-04-03 05:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fee6437c9fa69e20dc40d782dcac384 SHA-1: b53e1f5738ec236afaa049473ed745c7b947abb7 SHA-256: 52783785b817d7fd83b4f36ba648673cfc2bcc484f821e8d50599929619f9b20
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. ClamAV detection and ML classification strongly indicate this is a phishing or malicious document. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wix?keyword=worcester+deeds+search
    • https://cdn.sqhk.co/pipezifiwip/jaiaggQ/jennette_s_pier_surf_report.pdf
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/b36e561c4bc4bf.pdf
    • http://thrivewebs.com/88609653085zb5h1.pdf
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/cc4ea32e98.pdf
    • http://toguvuveleguna.22web.org/31456223552.pdf
    • https://cdn.sqhk.co/zesozote/idgijMv/simple_business_plan_example_bakery.pdf
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/d778ce453.pdf
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/3499537.pdf
    • http://ranomurivokav.22web.org/votuwesetinedubulo.pdf
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/4026600.pdf
    • https://cdn.sqhk.co/velabolo/if62b2s/seed_minecraft_pe_village_2020.pdf
    • http://fortuneo-enligne.com/echo_weed_eater_string_stuck_insideyrbwi.pdf
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/208781.pdf
    • http://thestablestl.com/dulomazanixsx9i0.pdf
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/senoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suxuzodezojoni.epizy.com/sefatemilaw.pdf
    • http://pugobafujopelat.epizy.com/catalogue_avon_aout_2020.pdf
    • https://s3.amazonaws.com/zatasipezeg/performance_parts_2005_honda_civic.pdf
    • https://s3.amazonaws.com/mogedozara/hotel_california_acoustic_guitar_sheet_music.pdf
    • https://s3.amazonaws.com/pukaridimupo/boxipuwebagerurikemexokam.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_off0000e533.bin
8aef97398a2e43905a6bcd97215608d0a11fed1da83a78ffcfda5155e2579ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 5008 bytes
font_01_sfnt_off0000f643.bin
61d6ebab1b9fed637456b2a974cbf92996b37aaed2dc0f139644d993b545af35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 11312 bytes

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