Malicious PDF — malware analysis report

Static analysis result for SHA-256 a958ee5b094c56d0…

MALICIOUS

PDF

69.0 KB Created: 2020-12-19 06:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef916b8b81def86230b98d4502c8ed03 SHA-1: 1740b0697f9b570d721b2d4796a10522abd609d1 SHA-256: a958ee5b094c56d00e7a21f419a8afb7378d602d5fb0eccbc63c5c4196aa6618
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on external services. The primary malicious URL, traffset.ru, is likely used to host or redirect to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse.

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://traffset.ru/strik?utm_term=first+muse+poem+by+julia+alvarez+summary
    • https://wamokanudetavud.weebly.com/uploads/1/3/4/5/134510572/b2004c.pdf
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/fitadopivenofud.pdf
    • https://robubafo.weebly.com/uploads/1/3/4/5/134588337/8599734.pdf
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/silelefib.pdf
    • https://basalulonow.weebly.com/uploads/1/3/4/6/134612360/likode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fd7c5871-7605-45fc-8d47-aecf43e7cf81/toxavi.pdf
    • https://uploads.strikinglycdn.com/files/89fb5428-acea-46de-a75b-75f427ad804e/mabelavibisurenatu.pdf
    • https://uploads.strikinglycdn.com/files/67fc4535-9086-42af-9f10-066e849a1633/8.snf_trke_anlatm_bozukluklar.pdf
    • https://uploads.strikinglycdn.com/files/7cf238af-e127-4667-9a64-7e6dad11baa7/71390103118.pdf
    • https://s3.amazonaws.com/zazelujeju/adobe_flash_animation_free_trial.pdf
    • https://static1.squarespace.com/static/5fc78fbebcf5f06bcb797f70/t/5fcbb05b8dcc5603bef9e12d/1607184475863/69281725999.pdf
    • https://static1.squarespace.com/static/5fdd46f08715ea0dc9cdbd2a/t/5fdd7594f23a830a59951064/1608349077419/funufeso.pdf
    • https://uploads.strikinglycdn.com/files/43b62b87-69a3-4948-a7ee-6614214defcf/33631184052.pdf
    • https://s3.amazonaws.com/rogugagatuf/4658645219.pdf
    • https://s3.amazonaws.com/mexavofezoxi/54121452318.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00f.bin
feb274da9736e8c3b04e77e8ca2b52ff744280030ad9e9bf8badb060ae998466
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 5348 bytes
font_01_sfnt_off0000e23f.bin
e2a8a7e1ac4d90bf01834ce287ced46a0a1cf23cc84e3c5f25e729eb998e15b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 10584 bytes