Malicious PDF — malware analysis report

Static analysis result for SHA-256 813a77d7503620d0…

MALICIOUS

PDF

78.6 KB Created: 2021-04-03 16:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a1aeadefccfc172938bfd1d49986b504 SHA-1: bc6d219b31ab43bd6711c67d84afa5a08e4e9d23 SHA-256: 813a77d7503620d04e5697f26275d341b74de06c3c6f94948f9d5cefa22b1b2d
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://gimoguvi.ru/wix?keyword=anatomy+of+the+constitution+whose+job+is+it+answer+key', suggests a phishing or scam attempt by impersonating a search result. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://gimoguvi.ru/wix?keyword=anatomy+of+the+constitution+whose+job+is+it+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383565/normal_6061152873c7f.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/fadujorutarepimonuguz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_606026516f4f1.pdfIn PDF document text
    • http://nugawijuxuv.mywebcommunity.org/akademia_pana_kleksa_cala_ksika_chomikuj.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/fitbit_flex_3_review.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/Y0qibhc/zenekupusutejedakigi.pdfIn PDF document text
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/6283204.pdfIn PDF document text
    • https://kegotewu.weebly.com/uploads/1/3/1/4/131437679/roledidas-nasira-pijideke-damoposerepa.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/qhjhagf/roblox_mining_inc_codes_2020.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/alcohol_free_cocktail_recipes.pdfIn PDF document text
    • http://mukovasisoro.mygamesonline.org/lemifiporometozuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_60109637aa799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a14f06d3-76bc-4010-8ea0-668d1b807671/48489300736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25bf92a5-8a2e-4cf4-b194-bbc54fb48563/wuwivukixanimijafifogex.pdfIn PDF document text
    • http://rifepegagitajip.epizy.com/4631791207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c13e89b-e93c-4086-bf29-1af2b64629ee/komegix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6e0b91-775b-4ab8-a7dc-1d1650ec8e8c/99903461600.pdfIn PDF document text
    • http://zorumiwopa.rf.gd/fundamentals_of_machine_drawing.pdfIn PDF document text
    • http://tasoged.epizy.com/aleris_novelis.pdfIn PDF document text
    • http://lidusikopi.rf.gd/nokavaxorib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1836a3b3-6887-43d7-be44-6620da649583/wizelulaxixizalogu.pdfIn PDF document text
    • http://numololutevib.epizy.com/razoval.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 5432 bytes
SHA-256: 69f11f0e731194204c2d1ca17f0580772460b3cd035cdca3c3f9dfd07cc61082
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 10448 bytes
SHA-256: d55302aebc74fb4b0501a581bd3dfe40ae29316cebce3d8ff2775de8b30e1aab
font_02_sfnt_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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