Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51f8deaf12073be…

MALICIOUS

PDF

41.0 KB Created: 2020-04-01 11:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: b9cec4d364e6f97c45ee1879850075a4 SHA-1: 987be3102c5b54cf65da1363131e1009a8cd9b88 SHA-256: d51f8deaf12073be2b80529425f4cf152759f944889fa8a7816182c9f82a596f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it functions as a dropper. The document contains numerous embedded links, identified as a link farm, that likely lead to further malicious content or exploits. The primary lure appears to be academic or resource-related, as suggested by the document body's text fragments and URL structures.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-9122838-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9122838-0
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://sjo105.com/uploads/1/3/1/4/131455463/131455463.html#practical+companion+to+ethics+4e PDF link annotation
    • http://inversefootwear.com/uploads/1/3/1/3/131383333/8428353.pdfIn PDF document text
    • http://callaneventplanner.com/uploads/1/3/0/6/130621803/ae6a23ac.pdfIn PDF document text
    • http://charlotteshope.net/uploads/1/3/0/8/130814127/8800931.pdfIn PDF document text
    • http://acloquelaw.com/uploads/1/3/1/3/131384539/juxozuwajetur.pdfIn PDF document text
    • http://jrhythm.com/uploads/1/3/0/5/130538985/gaxuxuvi_modal_kiboxogutujegi_falijofupupaged.pdfIn PDF document text
    • http://platinumprecisionvirtualsolutions.net/uploads/1/3/0/4/130475923/separ-pizelivuwelo.pdfIn PDF document text
    • http://letstryinonrealdomain.com/uploads/1/3/1/1/131164239/bceb2d.pdfIn PDF document text
    • http://pushingthetippingpoint.com/uploads/1/3/1/0/131070189/174228a5ad005f3.pdfIn PDF document text
    • http://clementcanopycondos.com/uploads/1/3/0/4/130476074/robowaxefedadufu.pdfIn PDF document text
    • http://thehandmadehydrangea.com/uploads/1/3/0/7/130740510/62a4c24ef.pdfIn PDF document text
    • http://baop.store/uploads/1/3/0/6/130605302/tabesaxem_jowonijekekili_nemelame.pdfIn PDF document text
    • http://sbcustomapparel.com/uploads/1/3/0/7/130775104/7862949.pdfIn PDF document text
    • http://dgdiamondgalleria.com/uploads/1/3/0/7/130775646/tadiza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn 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_off00006b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B77 8340 bytes
SHA-256: 1f179b97234f7141755c2d800068ed5f1f9282a9d302726a49d8de79d4b2e191
font_01_sfnt_off00008bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD9 2604 bytes
SHA-256: 1e40e98b03ddbccc880877284e0fa26e3d6152a239967a2ea6f35cc1f6244ff9

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