Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33bbd275b1532da…

MALICIOUS

PDF

71.5 KB Created: 2021-03-09 11:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5aeae54507f0f62ac56b7a2246af0049 SHA-1: a8e0f0d78f11eb5524ddbebfb930b21b0cdd1a19 SHA-256: c33bbd275b1532da52ac97c28bfc48d0ce0398978d7b683a983a6751f4c6997e
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=field+guide+to+kanto+pokemon PDF link annotation
    • http://lightstart.xyz/abbott_freestyle_libre_user_manualwozhr.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/tebaw-biragefelisixub-bevatu-mipanimireri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_600efb47cf01a.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/9b84b916ee.pdfIn PDF document text
    • http://superheatbelt.xyz/369842288833gluz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_5fdb2f652e644.pdfIn PDF document text
    • http://graatorama.fun/bushmaster_model_xm15-e2s_accessoriesxzuk2.pdfIn PDF document text
    • https://piwaxokireruber.weebly.com/uploads/1/3/0/9/130969414/2aa57f.pdfIn PDF document text
    • http://logemopi.22web.org/87328188155.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/829d775fa71a9d.pdfIn PDF document text
    • https://vezulapas.weebly.com/uploads/1/3/0/9/130969209/sunujan-dinewil-zevugolivos-dozofeg.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/8567557.pdfIn PDF document text
    • https://penebiji.weebly.com/uploads/1/3/5/3/135346042/b67dea36d3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376101/normal_5ffa39094ec18.pdfIn PDF document text
    • http://gta-msk.ru/static_electricity_worksheet_grade_5jrlsn.pdfIn PDF document text
    • https://mesowusiwa.weebly.com/uploads/1/3/5/9/135975120/ronedituvevesew-watuzisin-munax-befoja.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/does_my_head_look_big_in_this_analysis.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
    • http://vilatelisoto.onlinewebshop.net/diccionario_strong_espanol_online.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/mapisagosikanemivir.pdfIn PDF document text
    • http://rosevasejila.myartsonline.com/gathering_storm_civ_6_new_leaders.pdfIn PDF document text
    • http://jasefagabegonu.epizy.com/8756444423.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/70915022281.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_off0000cd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD54 4908 bytes
SHA-256: 45ae62a74f957407e28fdab7937622296eb8a4adffa98dd85ea055527d584c01
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 10344 bytes
SHA-256: 2fab5a722fdac74b5e8d3340d4ff9781241d80b50d177ae6382f08773b98904c
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176