Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d589eca232cbeed…

MALICIOUS

PDF

87.8 KB Created: 2021-02-17 17:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8c0d4d7f809cfb2b7f533359655f6f5f SHA-1: b5d68098e90a148723c771523315695ffcaac51e SHA-256: 5d589eca232cbeed88dc49e798f1506364be41eaf485d7d51099f0daed7f520c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm or phishing campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/aws?utm_term=photoshop+shortcuts+macbook PDF link annotation
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/038870.pdfIn PDF document text
    • https://cdn.sqhk.co/nejijilo/iizhjgj/star_wars_movies_galaxy_s_edge.pdfIn PDF document text
    • http://italywow.pro/17470935191je6n1.pdfIn PDF document text
    • http://daimontimur.org/ralph_waldo_emerson_natureudnzj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5ff4d031bd5a8.pdfIn PDF document text
    • http://healthytrands.com/kamaxifovupimiza55yb.pdfIn PDF document text
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/396394a3935fd2.pdfIn PDF document text
    • https://zepusarogetiki.weebly.com/uploads/1/3/4/6/134687077/2272868.pdfIn PDF document text
    • http://mebel-albero.ru/phet_simulation_energy_skate_park1l13y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5fc751a4f1769.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/5mggEii/smart_balance_butter_ingredients.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_6010ff73724c0.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/phjjhih/paintball_store_near_me_open.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/kxicShd/real_boxing_2_creed_mod_apk_latest.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448103/normal_5feb6a4de2bb4.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 5344 bytes
SHA-256: e9ee57ebb7ef5ec1e98560ddc3e8017db55c9736225d9746265ba7ad6c10d368
font_01_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 2108 bytes
SHA-256: 2eda378403ea27f505f3806530877394f357edf6206e26f5d7d085d6a9478202
font_02_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 11048 bytes
SHA-256: 8e4e4b9162a0f96ce96046f2f3906afdabd32f623156cfb26ff560543887a0f9
font_03_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 16104 bytes
SHA-256: 712590c835452c60cf4005d5ff3b4291b7bdb94b5c22500be4ce3d5353b46ed1

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