Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f1451173686ae2…

MALICIOUS

PDF

74.2 KB Created: 2020-11-25 13:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 310b1b8983db1f999269b5b499e46bf6 SHA-1: 65cab204e04cd97ef035ae427863245bd8e9b0fe SHA-256: a8f1451173686ae2eaf98538e18aca238fdb0ce03fd9539e226ad012b645e5cc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary URLs, 'https://trafffi.ru/strik?utm_term=plant+based+diet+books', appears to be a lure for users interested in diet books, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/strik?utm_term=plant+based+diet+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412896/normal_5fa34d0f43518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5fa2d339ba989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f9057ed181b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fa801982bca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_5fab277567aa6.pdfIn PDF document text
    • https://xenapake.weebly.com/uploads/1/3/4/3/134353424/dapegunasit.pdfIn PDF document text
    • https://jususisizeka.weebly.com/uploads/1/3/4/2/134266965/5761084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f9c91f2adc5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_5fb5a28045026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5fa924540f448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5f941907be128.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://uploads.strikinglycdn.com/files/72d8bc3e-2a63-43cd-b0a4-70f01de64d76/kidinipoxapezupumuzud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffefe712-4c2b-48d7-ae21-1c0aa86c13a6/26419576824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118aac6a-2524-4229-81a0-3c5adc1c9e40/73316250722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06db117e-1eb1-4f4a-bb22-7c9179841682/zobotozevuxefuniki.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_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 4716 bytes
SHA-256: 4fba8aa38827388b28069594cfd6d52f96fbfd6e017a360b4d50fbca14c7e9aa
font_01_sfnt_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 10376 bytes
SHA-256: 8bd5c9fbaf349807b1e9cf56b3dc9101ed12c1177663066684aa6ee2406b00b2
font_02_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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