Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ac63e846ef2b69…

MALICIOUS

PDF

79.0 KB Created: 2021-02-27 16:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1b5bf861f05b7d500672d88b51939856 SHA-1: c255a640240e76b3df80474f9788ece94bc48cd9 SHA-256: f1ac63e846ef2b69f19b7e3bde5f451d24dddeffeb7c75e882afaa60675f2552
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of techniques used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://xajibur.ru/wb?keyword=coleman%20tahiti%20spa%20parts%20list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377113/normal_600019c3f01b0.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/kadigazap-dezemex.pdfIn PDF document text
    • https://lubipufubuk.weebly.com/uploads/1/3/4/5/134597980/4e381a3252c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6016ebda7937f.pdfIn PDF document text
    • https://xunedoworevesa.weebly.com/uploads/1/3/1/1/131164322/gutakoxe_zerasu_jedimofopazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fef7d386e84c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5fd2625017504.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/3e545ed3d911.pdfIn PDF document text
    • https://fufajogaxofamu.weebly.com/uploads/1/3/4/6/134627879/xanegajewonelujif.pdfIn PDF document text
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/5408620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5fde1891dae96.pdfIn PDF document text
    • http://zelolugo.22web.org/charles_taylor_sources_of_the_self_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448720/normal_5ffd38fe5ca27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464873/normal_5fcdeae126b5b.pdfIn PDF document text
    • https://bivolureru.weebly.com/uploads/1/3/4/5/134583024/xumibexuvixer.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/3883772.pdfIn PDF document text
    • https://bibokesoxi.weebly.com/uploads/1/3/4/8/134850131/kofop.pdfIn PDF document text
    • https://supipujijasof.weebly.com/uploads/1/3/0/7/130739476/wisisa_xosofu_vekin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416805/normal_5ff115ed6a575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501774/normal_5ffcd3d988c9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifopufu.epizy.com/chemical_safety_data_sheets_nz.pdfIn PDF document text
    • http://fadajoja.epizy.com/spotify_desktop_files.pdfIn PDF document text
    • http://simebowum.rf.gd/weight_watchers_scale_manual_ww52.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 4964 bytes
SHA-256: 8d5cd2105b0d4d5648980541e2c4968573e77b66900601603e2ea1ca5292a7a7
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 10776 bytes
SHA-256: 1a57e1728901c27a5308d4662cdce8ab773e19cdf2fa37a1c10b430e2eb9025b

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