Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56203b653370ef5…

MALICIOUS

PDF

78.6 KB Created: 2021-04-06 18:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80fa2c6ef45b92f3f9250a8bfa1866f2 SHA-1: d66162a63c010bb2ec584effddbd09625c648367 SHA-256: c56203b653370ef55197baa8753a2d32bbdcbe1d3912f999d6ecbd347652bda3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=qualitative+and+quantitative+variables+worksheet
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/feruk_dujimixos.pdf
    • http://gadevafeto.iblogger.org/ina_bearing_catalogue.pdf
    • https://cdn-cms.f-static.net/uploads/4481684/normal_600e85daa0128.pdf
    • https://cdn-cms.f-static.net/uploads/4367617/normal_6051235113b79.pdf
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/fcd18970535.pdf
    • https://cdn-cms.f-static.net/uploads/4449421/normal_6020fff314eac.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/7303575.pdf
    • http://vojemodipu.sportsontheweb.net/georgia_driving_test_answers.pdf
    • https://mubafuzolifuben.weebly.com/uploads/1/3/4/6/134644730/5087112.pdf
    • http://denarop.22web.org/dyson_v10_animal_cordless_hoover.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b3194b58-037e-412e-8d31-efcc8719a83e/zateledotigipo.pdf
    • https://uploads.strikinglycdn.com/files/ca5dc40e-b6fb-49bb-bcf1-8b12ab580d27/boston_market_open_on_christmas_eve.pdf
    • https://uploads.strikinglycdn.com/files/0f4cb395-c39b-4ea3-a6a7-9e45efb231d1/corsair_760t_atx_full_tower_case.pdf
    • https://uploads.strikinglycdn.com/files/102a08f3-69f5-4cb1-8175-3080ab62e107/6.0_powerstroke_engine_parts_diagram.pdf
    • https://s3.amazonaws.com/geradi/bomalesa.pdf
    • http://xenexafa.myartsonline.com/mepazemoxawajiju.pdf
    • https://s3.amazonaws.com/rebomedug/durgai_amman_song_mp4.pdf
    • https://uploads.strikinglycdn.com/files/9f9a6d9c-c9b8-4ca2-a1c7-4f32aa32d1a4/cloud_9_2006_movie_download.pdf
    • https://s3.amazonaws.com/lazesej/sokejagutej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e636.bin
0882b5c5e788134a7f49934a6ea59a476bcb555215b89e070f058feb342a782e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 5340 bytes
font_01_sfnt_off0000f860.bin
cc6cb21122cbe199b05c6ce2d4e88caafec81af11e4876249edaf283de544384		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 11212 bytes
font_02_sfnt_off00011e84.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 4324 bytes

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