Malicious PDF — malware analysis report

Static analysis result for SHA-256 850e3f930cdbe15d…

MALICIOUS

PDF

74.4 KB Created: 2021-01-03 08:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 196cdda1e7e9108b2d8824a50331e01a SHA-1: 199fe365ca2e9da3061137e84d8019001c9f0781 SHA-256: 850e3f930cdbe15df10191a425e461c8afd29995c0fb3f21d644b1bd9196bf12
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains or known malicious redirectors. The primary purpose appears to be directing users to potentially malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=willing+to+learn In PDF document text
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/da388b4e738.pdfIn PDF document text
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/e3d76.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/hiieGja/86059716942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f87ca730547a.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/5387898.pdfIn PDF document text
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/9695291.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/idWVrwN/64139834390.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/puwanativa-rapen-detevabutigeg-niromomuto.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/goguxezesusulamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zukogi/beetalk_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f81ced1-780b-4c51-8e4d-f7a599ed6bae/kesikesubajov.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/28424519678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8412cc6b-de0a-4c06-921d-01b51ac85793/lincoln_225_ac_welder_parts.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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 4688 bytes
SHA-256: 1cd3ae9a8577dca83bde016f30a47461be030e647df3d37c5d6734cb512a3e85
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10560 bytes
SHA-256: 80c3ae8e8ada99efc67ce732bd8f6b8db872716b5daef7e2fdc7cf67f202131a

Open this report in the interactive analyzer, or submit your own file for analysis.