Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b63e8c0d64eab35…

MALICIOUS

PDF

62.3 KB Created: 2021-02-05 05:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fdbf7102ee787584eb7a130c2cd9429e SHA-1: b383bd1e64eb23e968af45e60d47e1720dbc0eb0 SHA-256: 0b63e8c0d64eab3541cfb27443a75fbb05455ca681009b0f54f57ff28e59b81d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, often used to mask malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jacksth.ru/aws?utm_term=bloons+td+4+apk PDF link annotation
    • http://numberoone.xyz/50053638313jg854.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/international_human_resource_management_7th_editionwf248.pdfIn PDF document text
    • http://intekzafast.online/troll_face_quest_internet_memes_walkthrough_level_5aaoid.pdfIn PDF document text
    • http://cparta.moscow/memerebotufod5denx.pdfIn PDF document text
    • http://uchebnoe.website/wodipaw6vqik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_5fcbdecbcc92c.pdfIn PDF document text
    • https://susotavawo.weebly.com/uploads/1/3/5/3/135325365/negenorowunodo_samip_falulow.pdfIn PDF document text
    • http://seedcraft.online/33366345847f0oxf.pdfIn PDF document text
    • http://ranking-se.com/leavenworth_detention_center_inmate_search4blz8.pdfIn PDF document text
    • http://wisitens.online/34295841450utca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_5fe9126bdde75.pdfIn PDF document text
    • http://videohost.space/77687210434ypzzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_601bb8a2d5aa9.pdfIn PDF document text
    • http://jirafka.space/lujaxasenepunazugizoxuzjqb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387806/normal_5fecb65136048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loxazugexola.epizy.com/1030410255.pdfIn PDF document text
    • http://pasalalu.rf.gd/album_cut_songs_free_in_tamil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 5056 bytes
SHA-256: 12f3111e48a801c23e550e41d0bc30b144f940acde5e235b68d1290ff8fe2372
font_01_sfnt_off0000c9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 10156 bytes
SHA-256: fabc1b5e0e00c4ecb092df3b6e7126da727f591a7c31ee495bb4e51a0c68df6c

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