Malicious PDF — malware analysis report

Static analysis result for SHA-256 3002c7ada2ed3166…

MALICIOUS

PDF

67.6 KB Created: 2021-05-23 11:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b4528ddf1f008fd359f3767395df3e4d SHA-1: 088a492427c2c9724a645137786375a685b2d145 SHA-256: 3002c7ada2ed31660bc5c1e0809c30c42145d8af88d937419842be8b22a2f7d6
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 a large number of external links, many of which are part of an SEO link farm, indicating a potential phishing or spam campaign. The primary malicious URL identified is a redirector, likely used to funnel users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://seumenha.ru/strik?utm_term=food+chain+gizmo+answer+key+page+2 PDF link annotation
    • https://jupovibofekek.weebly.com/uploads/1/3/4/4/134490290/5158131.pdfIn PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/meratobadim.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/8d368.pdfIn PDF document text
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/popevur.pdfIn PDF document text
    • https://wepotupibir.weebly.com/uploads/1/3/4/8/134881259/1038990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fd2e6beb04df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fd7225a023cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_6027bd0964393.pdfIn PDF document text
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/saxuz-kazun.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/4209051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_5fd1d12f36699.pdfIn PDF document text
    • https://kitupiver.weebly.com/uploads/1/3/4/4/134446404/4652017.pdfIn PDF document text
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/megilolisojipu-nupoxiputimiwu.pdfIn PDF document text
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/nufivamudolazame.pdfIn PDF document text
    • https://zegasapazenavu.weebly.com/uploads/1/3/5/3/135326880/9269141.pdfIn PDF document text
    • https://jamibada.weebly.com/uploads/1/3/1/1/131164428/velotovosako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gekojulog/tuesday_with_morrie_quotes_about_family.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/jegesatib.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/hogwarts_castle_3d_model.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/xuzupunijeliger.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_off0000ca3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3B 5852 bytes
SHA-256: 6c35e3313722b5bb3326317bdfccb67ed8f3af71a373b544f98a74d07abf3c80
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 10172 bytes
SHA-256: c91ac6537d41e3cdd0330629bf856f602df2a7c606350ed9128284c103f6d55b

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