Malicious PDF — malware analysis report

Static analysis result for SHA-256 88874d408a170f1a…

MALICIOUS

PDF

83.8 KB Created: 2021-02-12 12:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9adf77b53196f3ca34df2bef1b1ca3b7 SHA-1: 9a12ed087a5c2e7e698db3a4a83ff103dc97de09 SHA-256: 88874d408a170f1aaac499b53469273fdddd42a7a7d45c03b753d197378c1294
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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/123?utm_term=big+bass+tournament+douglas+lake PDF link annotation
    • https://cdn.sqhk.co/jolodovi/cYjjigw/love_letters_kc_hours.pdfIn PDF document text
    • http://helpforteam.com/learn_php_html_cssf1pc0.pdfIn PDF document text
    • http://edapog.online/3321404935ggdla.pdfIn PDF document text
    • https://cdn.sqhk.co/murevexi/bupG1jb/6892484758.pdfIn PDF document text
    • http://itawegan.space/71990434713nik9g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_600b495a0e9c9.pdfIn PDF document text
    • http://milanbeachs.space/63776672479me50u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_6000bf43157c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_60208c1b87c54.pdfIn PDF document text
    • http://tesocoin.online/calculadora_de_iva_retenido_sat33zl9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409806/normal_5ff2d545c60be.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jhjXhfE/luzuse.pdfIn PDF document text
    • http://vknart.xyz/ielts_placement_test3g3qg.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/8jhjbhb/business_management_wikipedia_the_free_encyclopedia.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/igShfgf/starlink_internet_speed_latency.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/ghaghXD/ketupat_lebaran_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403565/normal_6003b67e5581d.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/kovezodepugov/97667877544.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/92271081062.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/phonic_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/asrock_g41m-_vs3_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 5280 bytes
SHA-256: 1615cee6ee5e41efee1165fd3d2b21aaa0ab056126463da51d94687302abb718
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 2484 bytes
SHA-256: 3957183e8ce92d98792d4d932155d0057f4773d25fcb72ecf8e2056c5eb9c99e
font_02_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 11600 bytes
SHA-256: 14990bdbfb93bcaa5674fde1b7025defd5f143b387a44d57dac34645e2a6fdaa
font_03_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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