Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91ab468507a10a4…

MALICIOUS

PDF

78.7 KB Created: 2021-05-25 11:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f3be93df9fb1671c31797a97a644860 SHA-1: f64cde09084e813a5632cf8310b9383ad8c8f462 SHA-256: e91ab468507a10a446ec32451af659cf41af083f98d4f500281334a43306f0c2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/strik?utm_term=o+salario+de+um+enfermeiro+em+de+o+saude PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372702/normal_60150aa50fad5.pdfIn PDF document text
    • https://torofije.weebly.com/uploads/1/3/4/8/134871751/2993375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_5fe6f2791420d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387702/normal_5fcf5a36a3c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_6036c6651c480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_6059abbe26439.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/notogezag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fde8cb1336ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_6045e3b8a8223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_601efda4b77a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5a94de-67c9-407c-b55d-d7bf08792a01/why_is_my_dishwasher_not_getting_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e636869-9a33-4731-9a3d-c18d4c09d16f/wabipabafuluxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c69df61-519c-4a40-968e-1111e16a892c/are_vibration_bark_collars_humane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed124ed-ad2d-4f34-8080-8c578b359b95/vujalajepofutisuzefekipan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10878b48-eaf3-46e8-aa46-2959e618f75c/dark_matter_comic_book_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21331ac-6b03-428a-819c-dec38bda4732/can_i_use_gimp_on_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606e2490-7213-4089-8fae-ff0bc58984da/87222562759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d916e3-3d91-48ea-bff4-1216aa06ea91/pyramid_principle_slideshare.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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5080 bytes
SHA-256: 269c4e671f6baa106ba0c764c8260fefa3c6b3f73c7600ee54c59b0de095579c
font_01_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 12600 bytes
SHA-256: 7cfc3b5f21429557be9171f11084ba320447a9ff6d66e39bf3ab43106af512aa

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