Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f37009dfe73b3db…

MALICIOUS

PDF

88.8 KB Created: 2021-03-14 19:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7404d71a38a9f1f3277b6fc2dd26f0b9 SHA-1: 206b6a2f5540e24cc9613c8824b13f4861da39e0 SHA-256: 3f37009dfe73b3db44d1506edfde8c5b8b3c0ddb1d08083f87f9c8cc3898aa8b
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=dell+inspiron+530s+release+date PDF link annotation
    • http://yozi.store/global_marketing_internships_summer_2020fs7td.pdfIn PDF document text
    • http://trenketo.buzz/7344520248nfbkh.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/tugumeb/71290028133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a0a712-ab1f-43fa-8561-4264816936ff/longman_american_idioms_dictionary.pdfIn PDF document text
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_40ec3a57d8a84cb69b8045999b1a97de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cefbeedb-e314-43ba-be8f-63d1833a673c/bixanimisijuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9c7beb-74aa-4b5b-92fb-74105d752482/lumizinap.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_b548689e231e427b8904eac23198cdf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8e882e-7ed3-45b1-a2fc-0ae41d13cfbd/bivata.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_146eadeda0b841dc9df9146d3823ead4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14062f5c-ed72-414f-81a4-fbb691d1dcf2/bosebowigirawo.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/83307057136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45c4beb-db31-4995-92ba-bc9c8b32beca/jomarivugukut.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/sexatipurazeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a73ba2b-8493-4679-b971-97bd43d4eb9f/matricom_g-box_q2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 5380 bytes
SHA-256: a0e59aed91f0272cd0ef5112d479e9bb5ac01a84855de952d856a6f472a126db
font_01_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 11568 bytes
SHA-256: 42b52ce9fe55c17adadf978cf623295763add84fa697ec85241f85f7d993602e
font_02_sfnt_off00013edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDC 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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