Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef46ffe2afb6d954…

MALICIOUS

PDF

74.9 KB Created: 2021-03-20 21:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a92718a1a614faea406ec22714ef8853 SHA-1: 0b9ecf969278227a8e1a6e621637c84c1b820506 SHA-256: ef46ffe2afb6d95421348327c4ff668319cf505a1633f40ea508e6c227ecbe85
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary URLs, 'https://resalured.ru/strik?utm_term=how+often+to+change+honda+accord+transmission+fluid', is likely part of this campaign. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+often+to+change+honda+accord+transmission+fluid PDF link annotation
    • https://luwimejimidilen.weebly.com/uploads/1/3/4/0/134040945/b12a2e7a.pdfIn PDF document text
    • http://presente-top.store/bawapujijidemxg455.pdfIn PDF document text
    • http://verification-help.business/netudelulowodepijiketi2bdz.pdfIn PDF document text
    • https://gezonawaja.weebly.com/uploads/1/3/4/6/134685915/bagojiwupuz_fowuno.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/kerag.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/line_6_hx_stomp_firmware_2.8.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/fezejipexawuwek_terexabuzaxujo_rilenokiramevig_ziwox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_18ace3b04fc2440db6f01bed5744e200.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_4c39ce6af3f94112950584c2e5619c59.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_f479c9d8fb624cb18660e5d1dd385d41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/pexasokezegapun.pdfIn PDF document text
    • http://litorow.myartsonline.com/2007_honda_civic_si_coupe_oil_capacity.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_0881e3af05a14cdca5a33614ab780367.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_d81847a3de8c4c8f985af767b1492157.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_8adde24d5305449190b4a5a565d1e58f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/pesasizusimu.pdfIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_27a1911e74c74d64884be9c5a622d85b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 5488 bytes
SHA-256: 84c3f8ea6f498d9e274800dd434cdfdbd30f427e4ebc9d16153564750e90faa5
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 10312 bytes
SHA-256: 92cf3d22f2948624f13f9f8a81d7613be3850021da1be57482a967b84b7507a5

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