Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc7dbb819da7a9e…

MALICIOUS

PDF

68.2 KB Created: 2021-02-23 11:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a0b1515062d29642489b04941ccd3564 SHA-1: bd15d0ae1976f9fdc78c0dd11b84511bd6c5886b SHA-256: 2cc7dbb819da7a9ec02be93bd5cd813260a44be3b344730ff50c6332a892a486
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, including a prominent one to 'jacksth.ru' which appears to be an SEO redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=2008+jeep+wrangler+unlimited+x+hard+top+removal PDF link annotation
    • https://sibomidejuxeda.weebly.com/uploads/1/3/4/5/134599986/102532.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/hdOehek/19018436067.pdfIn PDF document text
    • https://nafepamozox.weebly.com/uploads/1/3/1/0/131070284/4fb6a7f549.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/Vgi2Mii/snes_3ds_gamestop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408587/normal_5fe3c2aa0a2fc.pdfIn PDF document text
    • http://majijeniwadimu.22web.org/zudususewufonirinunalof.pdfIn PDF document text
    • http://lebolugu.iblogger.org/alien_blackout_android_game_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6034416675984.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxufaxurawago.epizy.com/what_does_hypersecretion_of_adh_cause.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/battle_trip_ep_155.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/85277243025.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/duet_premium_apk_3._2._1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/mp4_horror_movies_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/bunev.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_off0000cb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 5864 bytes
SHA-256: c0ded0b04888709aa8615db7460940d0a9a93bdc66470206565b7f986628ba6e
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 10748 bytes
SHA-256: 5d2fff659ed07eee1189e8839b08ec14376c1e827728e266e5d695b3542cbc84

Open this report in the interactive analyzer, or submit your own file for analysis.