Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58eeac12dec5f97…

MALICIOUS

PDF

76.3 KB Created: 2021-06-14 12:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 71bc0abe07bb36518b055651a1fc038f SHA-1: 8010eb4b23a859e600f8cd3629f8375bd57c677b SHA-256: a58eeac12dec5f976546b79d82b723f0b1d09319d4c189aa7a6b7b2df44e2a79
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gimoguvi.ru/123?utm_term=cover+letter+templates+creative PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496828/normal_602760ec9762e.pdfIn PDF document text
    • https://naxonefewu.weebly.com/uploads/1/3/5/9/135961026/nokijerupedamalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_606ea613d853c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_6046bc0b824c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_6032d07be44d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_6035c2300afea.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/kowamuke.pdfIn PDF document text
    • https://taponoranasigem.weebly.com/uploads/1/3/4/6/134643922/balojorepajiwi_bemuwazadeb_kategefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5ff3c05cb8033.pdfIn PDF document text
    • https://bejaluxixobig.weebly.com/uploads/1/3/7/5/137506446/6001016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajaduxaxusi.pbworks.com/f/miraculous_ladybug_season_4_episode_2_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3eee757-8e3d-4008-9a6b-b78a618c32dc/20151507329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b536966c-76b8-4be0-859d-d6b521eaca95/68614602174.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/telujuwetip.pdfIn PDF document text
    • http://fezosubi.pbworks.com/w/file/fetch/144780768/bayesian_statistics_the_fun_waydrive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b33ffd-7a86-48dc-85ab-c2a2e9eb20df/which_cordless_waterpik_is_best.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/xumawafatimapobupide.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/78650175363.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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 5044 bytes
SHA-256: a24bb8a8ca5aaab9df089038b0bae75360148ba2e3f7bbbf53d92ca0ed9303b6
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 11108 bytes
SHA-256: a0621fcc0de6db87e11434e2f786dbd352ab534fae60dd63286dbbb45bc883e3

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