Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aae5b5450cf8bd…

MALICIOUS

PDF

88.8 KB Created: 2021-03-08 00:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 584c3286981b0d5a88e6e7228214ab6c SHA-1: 3d33d8b95d43a1e5b50fbc921b489be41947ee48 SHA-256: 23aae5b5450cf8bd5aab28a70fc0e0d2c556d03db112290a9bad1be83aead3ee
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, potentially for SEO manipulation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/wix?keyword=dark+souls+2+ign+guide PDF link annotation
    • http://chategratis.online/butibigadaje1phtl.pdfIn PDF document text
    • http://akfb.online/epigenetica_zanichellikmmjm.pdfIn PDF document text
    • http://akvatehnika74.ru/cheap_thrills_320kbpsszdxk.pdfIn PDF document text
    • https://xixolediz.weebly.com/uploads/1/3/4/5/134513169/7386c.pdfIn PDF document text
    • http://everydays.space/cisco_webex_board_55_ordering_guide4gk81.pdfIn PDF document text
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/purubebiwogameropil.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/9c25c666c6c23.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/what_causes_hot_spots_on_your_scalp.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/pejakuxarapubop.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/29920472153.pdfIn PDF document text
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/6732972.pdfIn PDF document text
    • http://youralteragoods.com/kodapomubufumaxusavos9lcod.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/xawovutezo.pdfIn PDF document text
    • http://topfrag.rip/xawefekogzknrf.pdfIn PDF document text
    • http://infonewstravel.com/el_camino_de_las_lagrimas_jorge_bucayrup7y.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/9206776.pdfIn PDF document text
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/4808264.pdfIn PDF document text
    • http://sk-anker.ru/vitamix_a3500_black_friday_20198yufw.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/19017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapufojutujat.atwebpages.com/xejafurubomuxajor.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_12136c4f8df44fe182ad2a7135ded88d.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_d9ebfa94c79a47baa43d5355e076d99a.pdf?index=trueIn 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_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 3600 bytes
SHA-256: 48862326178c9e2905e5d0c7f84f708c4b0e2274cf7fdade00e6848db9728dd2
font_01_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 5188 bytes
SHA-256: c976b7f8045413470afb2fbbb763dab68bd566bcc86ebf18c0e2da79bbc8cb78
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 14776 bytes
SHA-256: 360c1b32caa3b0045000c85d9c6f9f7e325874db3d54aed378137e7bc3cc43fa