Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6a3184058dd61e…

MALICIOUS

PDF

84.1 KB Created: 2021-02-22 15:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f5d2a46e7fef07aaaaad7ea9698015f3 SHA-1: d34bf2a69826b57feb25dd35cdf1bf7174049866 SHA-256: 5f6a3184058dd61ee5161e2674ee50dae9619ad205bfc5e333e92b3d71d8817b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=singer+31-15+service+manual PDF link annotation
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/miwedaw.pdfIn PDF document text
    • http://medicalpracticementor.com/bose_soundbar_700_manualf6cfs.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/jiRxhij/green_bubble_tea_walnut_creek.pdfIn PDF document text
    • http://onlinetyz.xyz/52591679960m7z4s.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/dpxFAia/menixikijubariropami.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/cfFq5hi/vepirigalawawimevodaxufu.pdfIn PDF document text
    • http://juilopkiretlo.ru/20411012066hf0or.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/cjjIRx3/love_live_wallpaper_download_for_mobile.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/e2446df82f.pdfIn PDF document text
    • http://badgesverified.com/townsmen_a_kingdom_rebuilt_review_switchmh9dx.pdfIn PDF document text
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/7dda5d.pdfIn PDF document text
    • http://donbetosstreettacos.com/the_new_adventures_of_winnie_the_pooh_vhs_uk6xo5d.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/bjhhhjP/new_york_times_paper_delivery_jobs.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://s3.amazonaws.com/zemunomipazikez/60794160377.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/bahut_aayi_gayi_yaadein_female_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/lepolalep.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 5344 bytes
SHA-256: 3fdfa2acff90f041b688774911c08d9bf503a7dd2e4be1fc036735e2bb5683ba
font_01_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 10848 bytes
SHA-256: ae17f5382add14a22645c04047c72f6538760afbc64cd232f57b5444630941f4
font_03_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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