Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c567531e36daf0…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 20:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 518a55c7bf26542782f934d5b0c9dbe7 SHA-1: a92d9dcb2a65c8357d7b251231cdb0f0ffbcb2de SHA-256: 44c567531e36daf0cf7dce86a549c3973aba0c12391220b77490de0004dd9634
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL leads to a known redirector, likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=jean+schloss+fugett+jr PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376621/normal_5fcf616824d45.pdfIn PDF document text
    • https://cdn.sqhk.co/gubalugotu/9ieWgdB/vojadoxetatujepabamudiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/heiejf0/11096911664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461511/normal_5fe7e7dfa608e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5ff5150cdbfbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481273/normal_6007377524d8a.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/Fjfjap6/50429188709.pdfIn PDF document text
    • http://segipaxi.iblogger.org/rifaximin_treatment_in_hepatic_encephalopathy.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/1td8ohj/tosabivibobekejijavapova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfa1772-0083-47f2-9e1f-9102a0699276/verifowavidedufefawi.pdfIn PDF document text
    • http://kovudefimure.rf.gd/12043517487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd687f6-f105-4d25-a924-374b3c337b4b/osi_model_7_layers.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/kemogimabisizakidogija.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/lowercase_alphabet_tracing_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/what_does_please_answer_mean_in_spanish.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_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 5208 bytes
SHA-256: 3d9af86eec723f087eb577a6bf0918531b00f53eb24721c796b511f19bb59cfd
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 10496 bytes
SHA-256: 0cc860d2ade988e526c04f5bfa7b2a964aac1bad4a6d310080b940000137e88e