Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a739f2020451b0…

MALICIOUS

PDF

88.8 KB Created: 2021-04-17 00:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 31bb83b65d5a8284dc1c674a7f3a45d1 SHA-1: 2689bcfd2951fb11dece42cebf132149eba218d5 SHA-256: 02a739f2020451b0e5ffca79c382229409accf180653595aedc61eca23d5f9e1
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it functions as a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. While no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=which+of+the+following+is+not+true+about+corporate+social+responsibility+%2528csr%2529 PDF link annotation
    • http://fubikopelemom.mypressonline.com/pharmacology_books_download_free.pdfIn PDF document text
    • http://xolululumaw.iblogger.org/el_sistema_endocrino_esta_formado_por_unos_organos_denominados.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_604d24a9e42e5.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/7735009.pdfIn PDF document text
    • https://dojinutek.weebly.com/uploads/1/3/4/1/134108596/5a9e04f920e67a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479213/normal_603387133dc0f.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/vojunaludo.pdfIn PDF document text
    • http://wafolepis.iblogger.org/www.bpsc.gov.bd_circular_2020.pdfIn PDF document text
    • https://tixiganotirof.weebly.com/uploads/1/3/1/1/131163533/7687128.pdfIn PDF document text
    • http://pubavamamuzagur.iblogger.org/yajur_veda_with_meaning_in_english.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/22767553819.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/kevirono.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://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_b8a54ce0ce364df2b894ca77d24af987.pdf?index=trueIn PDF document text
    • http://dimegebewode.epizy.com/70396580230.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_c21e068bf2164b39921918f2166562d5.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_d3bb4c014f584c929d0f728ecaf6cfcd.pdf?index=trueIn PDF document text
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_8940a9a22368494ab8ddb3f84a837c61.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_064baa3ddbc14c1db1caa93742b4df15.pdf?index=trueIn PDF document text
    • http://zulonojaminipe.rf.gd/avenged_sevenfold_bat_country_mp4.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_5049eb5a228b4fa5862e107a54420039.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_f02b912dc3c44adf84ee368e3fd21ec7.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_4dc6aed9860f47fe835ebbc978947cf1.pdf?index=trueIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_5fef586d7a1044a6a682f26635736bcb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 5660 bytes
SHA-256: b65c69ac93dfb91b6e817fb5cda63da9e23ecf0c4d09d57558faeadca984b5c8
font_01_sfnt_off000120fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 10552 bytes
SHA-256: 39d9ae7b9af1b03c05c5745f4bd38e9a8b8a6347f6b8039e00af087dae582ce0
font_02_sfnt_off000144bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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