Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd9a3a9cf248b51…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 09:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 429d51bbee56ee28b86696a1447308ac SHA-1: 8685b3d01412aed54cea31cc3aaf4c3fcb7775c4 SHA-256: dcd9a3a9cf248b510278f97e9607510dff7db6bc22ac2eda0c5f70b16c4be75a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://xezojetit.ru/123?utm_term=power+season+6+episode+2+parents+guide PDF link annotation
    • https://xazezegusi.weebly.com/uploads/1/3/4/5/134505133/fekivu_bejebe.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/lovipeku.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/4gche8M/dymo_colorpop_label_maker_tape.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/19aicPX/wiman.pdfIn PDF document text
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/1178622.pdfIn PDF document text
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/ketajokinizupafi.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/sikuva/79350250713.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/70918293842.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/ck2_conclave_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30c3903-4221-4fa6-b577-ceafcd4aafb9/mogizuson.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/lotufomirozexob.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/business_analysis_diploma_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a62e406-c13a-4773-90af-7cf854b6d6ac/filtrete_3m_thermostat_low_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c4b291-414b-414a-a406-f0646aab2d56/62026999082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf8e35c-77f9-4a45-a7f7-cd8435abb8cb/how_to_connect_my_hp_deskjet_3632_printer_to_wifi.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_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 5472 bytes
SHA-256: 9326b4e6c26f078436af8118fd0c3e4a62ea94aa0923c9c6da9844928d10e057
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10976 bytes
SHA-256: 505ad4df5fa37d32666c72537f4b94bec040e406a94c8aa0f7b2c3e67e7a755a

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