Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d25307f4cc7372…

MALICIOUS

PDF

75.8 KB Created: 2021-03-20 08:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 51e2e2465ab7331d4f25abc489e18a62 SHA-1: 558b68d4bf09714021fa1fc025f8db00851fb9e0 SHA-256: 92d25307f4cc73722754bd401249dccba60614f283b06c84bb1f6840d2225c44
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous external URIs point towards a tactic of overwhelming the user with links, some of which are hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/aws?utm_term=how+to+prepare+for+paralegal+school PDF link annotation
    • https://cdn.sqhk.co/pugepavofu/o29GiiA/viral_video_views_booster_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/8PjeLFN/deriwusigonipurigegozepe.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/iighjcY/amul_ice_cream_store_near_me.pdfIn PDF document text
    • https://kerimoseb.weebly.com/uploads/1/3/5/2/135299904/6992047.pdfIn PDF document text
    • https://cdn.sqhk.co/rovujesox/Rgie1ie/aftab_e_alam_book_free.pdfIn PDF document text
    • https://jogijomovap.weebly.com/uploads/1/3/0/9/130969693/pulakazodug.pdfIn PDF document text
    • https://wilivaja.weebly.com/uploads/1/3/2/6/132682565/getiwo_nesonufetefi.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/hjegdjh/sodoton.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/KheyiVl/canadian_visa_application_form_for_pakistani.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/Qha1Rje/davobekamewefuvazil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_e91b7a2d9d84459fa6f440c3e227f7d2.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_95af8dca83b84c28ae5ff3c9684a5db5.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_3b7cbfa7191d4c4a91638542af567bbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cfe652-4dc0-4111-b79e-8bfbe01e30c1/bowflex_treadclimber_tc100_safety_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a363a1e-bf4b-4429-b316-ffafa764551d/18912310543.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_3a46a04498ea40f8b3f1832564251c3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d06ab0-0301-45a0-8e8a-21b770766542/las_tablets_polaroid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20429528-fc13-45a5-97ea-34074f99eaba/82840796355.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_bef375bf2e6e4a2c94119628fd0d84d6.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_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 5332 bytes
SHA-256: fe3d4eb5d1d5d0958222bb7ab2f55d0a83f04d2035a628f53c747c6e9798d23b
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10696 bytes
SHA-256: 7abe149481ad1c2095bcad310a3baa7964da7558d6e8b61a0542848a94300a9c