Malicious PDF — malware analysis report

Static analysis result for SHA-256 49043f00da1a3ce6…

MALICIOUS

PDF

86.2 KB Created: 2021-04-13 22:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 153a5756679c3ab264eed3758f70f6ef SHA-1: b63092e2ac45f4ae33445ad3a78c927a45cdfbc2 SHA-256: 49043f00da1a3ce6673eba9ec9285a3c686a1afaf3d76ddd0d8f6b03355679ae
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One prominent URL, 'https://jacksth.ru/strik?utm_term=hp+probook+6560b+wifi+driver+download', indicates a lure related to downloading drivers. The PDF structure and embedded links are consistent with techniques used to redirect 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://jacksth.ru/strik?utm_term=hp+probook+6560b+wifi+driver+download PDF link annotation
    • http://dufifudusimube.mygamesonline.org/semajojefifepebujobimutu.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/come_home_to_roost_idiom_meaning.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/94626778090.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/Kjficic/101._9_lite_fm_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwametin/hgPcgc5/asian_tv_hd_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/jgQy6z0/lego_marvel_avengers_movie_4_thanos_robotu.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/cehbnKl/bryant_plus_80_furnace_service_manual.pdfIn PDF document text
    • http://xojopimo.22web.org/wavotuzadid.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/5DgcELr/us_national_park_service_merchandise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7f31680d-9b28-48c7-bfc0-7fc80b031f91/bissell_crosswave_pet_pro_cleaning_station.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734db7f3-6338-4fb4-a18a-69dc833f2206/61442497248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b207c426-f901-4cf2-8e39-017919810789/directv_genie_mini_model_number.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_57c14f28c549478bb736e0f9ff26c2e8.pdf?index=trueIn PDF document text
    • http://gaxopuna.epizy.com/57359210692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f61fe7-e53a-4122-9161-60fcde3f686e/what_are_new_tax_laws_for_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d381989d-144a-4f4a-9425-2eab1cda7c6b/wijejafut.pdfIn PDF document text
    • http://durunorutap.epizy.com/wawoguwifa.pdfIn PDF document text
    • http://poxemibusap.epizy.com/product_catalogue_template.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_cb7095b8dfbc408e984a0052cc036c1f.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_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 5304 bytes
SHA-256: 1e4d7496dd6a68ec2bdb85e44655c3df4558f45eba6462bca757a463d5b404a2
font_01_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 10708 bytes
SHA-256: 0e41701ad3dac6a653130f6b172649595afe88e79c60a875eed6f0332aa1c778
font_02_sfnt_off00013d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D36 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e