Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccfc81e828abdf1…

MALICIOUS

PDF

77.7 KB Created: 2021-02-24 05:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ac8efc15d72e19137b1cefbd833b822d SHA-1: 2b1100b6be83812b5104c0ad99d4e3caa9cd1b78 SHA-256: fccfc81e828abdf1205dd358c6c188c785083c0eaa72b98c0500abf7d1e5eced
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to Weebly and other hosting services, suggesting a link farm or redirector strategy. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate that the document is designed to drive traffic to SEO-optimized pages, likely for phishing or scam purposes. The presence of embedded URLs and the overall structure strongly suggest a phishing or malicious redirection attack.

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://druttle.ru/strik?utm_term=light+novel+recommendations+isekai PDF link annotation
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/nawexume_rixotu_lepepad_mebemuvi.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/85767b56e.pdfIn PDF document text
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/1995544.pdfIn PDF document text
    • http://premial.su/vevivisuewbpc.pdfIn PDF document text
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/fefifuvowa.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/fOWzBWa/81936160097.pdfIn PDF document text
    • https://jupoxoguji.weebly.com/uploads/1/3/4/0/134097256/xomosomel-penazom-juduwogarinapi.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/bojoja.pdfIn PDF document text
    • http://zuzimosutikume.22web.org/total_quality_management_certification_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kefelogo.epizy.com/call_of_heroes_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/2017_lexus_ls_460_l_specs.pdfIn PDF document text
    • http://funazowo.rf.gd/rabeberejuze.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/45226475779.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/fubusataxuz.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/tazigiduwozo.pdfIn PDF document text
    • http://bozolukiket.epizy.com/quanto_ganha_um_delegado_da_policia_federal.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_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 5416 bytes
SHA-256: 0f07d57646604d38942c5cc279b55dde8adf425cdff92bfc0bee27e51eb43011
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 10504 bytes
SHA-256: bc385f015396b445b5eb40aa0da0bc356e4c3889f73ed90f78e6a84774689191

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