Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ae0bb0ac3ea96c…

MALICIOUS

PDF

83.5 KB Created: 2020-12-23 15:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 99da1accf418a54e388062d33b24593f SHA-1: 40cbfddebb168aa4e21ded4c66e3f9506c5cf68b SHA-256: 17ae0bb0ac3ea96c84daf1d63b82b72894de09721e574fece38044042172b953
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://traffnew.ru/aws?utm_term=open+broadcaster+software++windows PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5fd0a5c20f4a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5fa6fc3d422d6.pdfIn PDF document text
    • https://nekamijej.weebly.com/uploads/1/3/4/6/134633096/7646953.pdfIn PDF document text
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/9742273fcc88.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/binifenot.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/514e76b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f881dce99751.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/jomukirenetalezatobi.pdfIn PDF document text
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/1079106.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/xagizasijopir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5f93bf38aae47.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/3333836.pdfIn PDF document text
    • https://gukegibulu.weebly.com/uploads/1/3/4/6/134668459/9366024.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/81255a7e-d88d-442f-8d11-5493531891ab/64374356747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31a026d-923a-4306-a143-b1407f5305a7/dorefogakisufafizej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81afa67-0e44-409c-af6d-c72d866f73b6/91167667481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d1385e-2c85-40ae-84de-7068f5b00abd/25072577236.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/xevufiropemij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8065d09-19e8-481a-a7c9-a55a44e105d3/nasup.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000117e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x117E3 23196 bytes
SHA-256: 33dd101ac06b42080b7ccaf81d3ed22b23ea3c8b6cac4ca5ea7fd7c6a4cc6caa
font_00_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 5376 bytes
SHA-256: 82d1af49068b3a118c241387a7392c1888424a96acb14147503ac7bea6e7b967
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 11156 bytes
SHA-256: d8731ec1a0b730995bd3e385398d004a2c4dd6e101aba7c4fbae45b76981b21d