Malicious PDF — malware analysis report

Static analysis result for SHA-256 773725c68311b416…

MALICIOUS

PDF

76.4 KB Created: 2021-02-26 19:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c6a95eba6c5713291ee4c726197ee17a SHA-1: 2101889f22d2ea61c79a9a94c23303910b9faa08 SHA-256: 773725c68311b416e0c60b582fd961d1ae38239159482a05c63c74c3ca22a387
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or a phishing lure for downloading further malicious content. The presence of an embedded URL and the ClamAV detection further support its malicious nature, likely serving as a downloader or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=best+end+fed+antenna PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425915/normal_5fd6f51923ba5.pdfIn PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/joratilam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_6010aedf2fbba.pdfIn PDF document text
    • https://cdn.sqhk.co/pusutekexu/GFchbTy/36832754547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_5fe36e121d2f1.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/hhYhexA/97923180408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_60306bcf687b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453906/normal_5ff7fd1e09805.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/hbahyha/rick_steves_audio_europe_travel_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_602546a8f09cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382407/normal_5ff15ad984bd8.pdfIn PDF document text
    • https://puwikemumej.weebly.com/uploads/1/3/1/4/131454306/gibulutimuriw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fe1f09f9d9c9.pdfIn PDF document text
    • http://pc-remont.website/best_graphic_design_portfolio_sitesjbkfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488604/normal_60191a6c0f171.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/2153143.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/legenapi/dalepubovimiketijutaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/norixorubibe.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/free_printable_envelope_template_a4.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/tcp_port_scan_with_nmap_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/xafaritojivajeterufoso.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_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 4824 bytes
SHA-256: f3708412bbb54b100d6e8aa4eb455384bea955495667a083724cbb9a83331e3f
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 11208 bytes
SHA-256: 7b082da13cd8bd4d87dd84c2aa956ebbeea7841961468a0658cf1b9819f6b471