Malicious PDF — malware analysis report

Static analysis result for SHA-256 536e0079314dbcaa…

MALICIOUS

PDF

75.3 KB Created: 2021-03-03 01:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 31d68b0db8d91d2ff393071bb3d158b7 SHA-1: 5dc3c43a65173f9e6af36eac3bc4f94131f7c8e4 SHA-256: 536e0079314dbcaad26300caa42abfe50417ffd4526c35f30a482e66839f7695
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting and are likely part of a link farm designed to distribute malware or phishing content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of malicious links. The ClamAV detection and ML classifier further support the malicious nature of the file, suggesting it is a phishing or trojan distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://midufefew.ru/award?keyword=john+deere+2653a+owners+manual PDF link annotation
    • http://rabusog.22web.org/puforowituzilisujowutu.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/ficgiid/74353571702.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/gl7hauQ/39921644024.pdfIn PDF document text
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/bufujixaxixa.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/giQhhgf/moto_traffic_race_2_mod_apk_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5fc659436af5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_603909583f277.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/gVjbgic/xmeye_login_password.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5fd2d2265b500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_603c66d41e269.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/b1p7yNY/75008567366.pdfIn PDF document text
    • https://cdn.sqhk.co/vusopukov/ighhRid/68771994797.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/xarilepimigevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fc9afb192e0d.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/cgj3SfU/nabubeberedefalasa.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/517fdfcdda.pdfIn PDF document text
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/3155224.pdfIn PDF document text
    • http://bujufamamaw.22web.org/aladdin_trailer_music.pdfIn PDF document text
    • http://mazanaposiwos.iblogger.org/calculator_vault_free.pdfIn PDF document text
    • https://zukafetovozod.weebly.com/uploads/1/3/1/6/131636890/wobakaboguponi.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/38605000942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexuboguke.epizy.com/zasazorasibuzosi.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/bisadir.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_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 5720 bytes
SHA-256: c6218da802b31a44cd2e793c0d42d5108662983d5106a5da08571b5a6adb4a92
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 10584 bytes
SHA-256: 072546325e0403bceda7e06c2524a77a3ff5c61b17b4a52a6b81e3a54d0ec071