Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b9e403bb644eb6…

MALICIOUS

PDF

201.6 KB Created: 2021-03-26 09:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9161e036358bd1c3d11298e42fd5fc14 SHA-1: 20765dc24aa8fa612fe4f7561bd44cd233d7d834 SHA-256: 85b9e403bb644eb611c375aaddb8e025967534750ba626f775b1c34c329ac54d
136 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating it's a phishing lure. The embedded URL 'https://baarspo.ru/wix?keyword=skull+and+shackles' is used as a redirector, likely to a malicious payload or phishing page. No scripts were extracted, but the PDF structure and URL suggest an attempt to trick the user into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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://baarspo.ru/wix?keyword=skull+and+shackles PDF link annotation
    • https://cdn.sqhk.co/salejejo/cgjHJjh/lubukek.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/ijidjhq/tubby_todd_hand_cream.pdfIn PDF document text
    • http://jubivigupowo.iblogger.org/asus_rt_n66u_service_manual_download.pdfIn PDF document text
    • https://zamigalimigarub.weebly.com/uploads/1/3/5/3/135326483/lolukilasop.pdfIn PDF document text
    • https://vujojetusifej.weebly.com/uploads/1/3/1/3/131398487/8439621.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/iiicaEw/elementalist_lux_dark_combo.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/edbaf4bb8aa1.pdfIn PDF document text
    • https://dusivasawomila.weebly.com/uploads/1/3/4/6/134660852/kofovogimuvek-wavasazidor.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/zatasipezeg/mitog.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/lesson_plan_templates_for_preschool.pdfIn PDF document text
    • http://boxalage.epizy.com/7-2_practice_division_properties_of_exponents_glencoe_algebra_1.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/buginexexodulofaruluvono.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_bc240516b27d46dc9f31c75e5bb3845a.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_63c283861c22440389a59586923675db.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_dd669d594e884a649ff284fac01e6c9b.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_3ba0a9e8712943d9ad3cb25d7ea7321a.pdf?index=trueIn PDF document text
    • http://nezenomawaza.epizy.com/celestron_telescope_70az_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c43f33a-b0a5-4849-9270-45fc29f8d57d/85458258545.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/bully_lite_mod_apk_rexdl.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/87977611805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/794f5ec1-2846-4b86-83fd-3cc94ded80ed/gubabaravidonanu.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_c2cdda751a28489f829dfb0affbcf9fd.pdf?index=trueIn 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_off0002de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE88 5096 bytes
SHA-256: 71ab717f859895f457cad67722f43caf65bb5832eeba1d828b7bb51eace7d4de
font_01_sfnt_off0002efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFE0 11444 bytes
SHA-256: 9cf7a563e0a1860bfe262b70a0e4738c53e0b30046fdbef8413c6fd683b517d6