Malicious PDF — malware analysis report

Static analysis result for SHA-256 351623f4db386c8a…

MALICIOUS

PDF

77.2 KB Created: 2021-01-20 23:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cbadefb84376331621a4a5b0c84c180e SHA-1: a94acc6a2a192e6cafeff419207bf174b33394b9 SHA-256: 351623f4db386c8a276ca048c8250edd48c713ba1f59179819381067b1c323b8
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirection and a link farm, pointing to phishing or malware distribution. The embedded URLs, such as 'https://cctraff.ru/123?utm_term=e-mrs+conference+2020', are flagged as malicious redirectors. The presence of numerous PDF links suggests an attempt to create a link farm for SEO manipulation or to distribute further malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=e-mrs+conference+2020 In PDF document text
    • https://woxamaxepid.weebly.com/uploads/1/3/0/7/130776503/nasebozatavura_kekad_kegozel.pdfIn PDF document text
    • https://fofulusi.weebly.com/uploads/1/3/4/7/134774969/pekokevufunamus.pdfIn PDF document text
    • https://bajewenizuku.weebly.com/uploads/1/3/4/4/134475359/3894891.pdfIn PDF document text
    • https://bujipivew.weebly.com/uploads/1/3/4/1/134131373/6285293.pdfIn PDF document text
    • https://site-1173505.mozfiles.com/files/1173505/rowdy_baby_song_lyrics.pdfIn PDF document text
    • https://site-1173508.mozfiles.com/files/1173508/19292051901.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/daselex/rewafakitugojozaziteti.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/lomagodikekame.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/84550378763.pdfIn PDF document text
    • http://xatonerux.epizy.com/asciidoctor_example.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/benzocaine-_menthol_topical_drug_information.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/sentencing_guidelines_drugs_class_a.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/beginner_country_line_dance_step_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/6702725529.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/self_appraisal_form_sample_filled_for_teachers.pdfIn PDF document text
    • http://disorasejazamu.epizy.com/72911909601.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 5048 bytes
SHA-256: e46aa76d6c3fe2f4eddbcbf5a20ccf00697149df1b1e448dd88e02d918adf918
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 12168 bytes
SHA-256: 1848028c11519aaa63178847282c952b9551957f632d95c39711fd80a6097503

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