Malicious PDF — malware analysis report

Static analysis result for SHA-256 611c62052aa9fc18…

MALICIOUS

PDF

79.2 KB Created: 2021-02-24 05:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 11495fd194ef802046c599b296ef58ef SHA-1: d3434fe966d6544d34c6f16cbf333dc27aeba1f0 SHA-256: 611c62052aa9fc18e97722a166f27cba763df7ea5a5d372e6edcecb5d2457eb7
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 pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/wix?keyword=numbers+to+alphabet+code PDF link annotation
    • https://cdn.sqhk.co/pulijidapis/acNheEc/40786567510.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/jeD0hf8/pukuxamewedilaxilip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fe50d64ec28c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5feecff5c75bd.pdfIn PDF document text
    • http://epipog.com/baputofawugezikekltgm5.pdfIn PDF document text
    • http://begemotiks.fun/binomial_distribution_problems_and_solutions5olut.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/hjhhcje/pekukepatina.pdfIn PDF document text
    • https://teduruperalugo.weebly.com/uploads/1/3/4/3/134320262/7626203.pdfIn PDF document text
    • http://linza.media/aerox_blue_black_2020win11.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/jiLEgcw/what_is_your_spirit_animal_test_buzzfeed.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/dzhWibq/sdgs_action_campaign.pdfIn PDF document text
    • http://erethiztzj.space/54706850669blji5.pdfIn PDF document text
    • http://civiliscmq.online/argumentative_essay_structure_exampleqw1vc.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/gpBggjl/pivap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418401/normal_5fecbd0a67738.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/f5ibzih/lepununim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 5424 bytes
SHA-256: 9214a01b9ad075ae90bc69ef64d492b3775fc62ae4d1c358bd2c397195863764
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 10876 bytes
SHA-256: 1f577359e65d9e7ee0bade6229d182d0ff07d4541072f287f501a8759d6e4ead

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