Malicious PDF — malware analysis report

Static analysis result for SHA-256 295bb38e0db3e9bd…

MALICIOUS

PDF

74.6 KB Created: 2021-02-22 14:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 93af61560cf4d063e07281604177dc68 SHA-1: ac6f059c5ae2e35f8920d71105261698cab96dce SHA-256: 295bb38e0db3e9bd8adccbeaa552a5e393ed55d1e6cc46e84978dc332a30c18d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or malicious redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+to+fix+a+ge+washer+that+won%2527t+drain PDF link annotation
    • https://cdn.sqhk.co/zovaratigu/c3jge39/28348808008.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/862862776657hbeh.pdfIn PDF document text
    • http://3gusevshop.website/kubodelujerebugi0dcda.pdfIn PDF document text
    • http://trycabinets.xyz/vowutugm8xb5.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/hdPjhOF/incivility_definition_in_nursing.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/jhjh8Ff/download_stupid_zombies_3_for_pc.pdfIn PDF document text
    • http://milano-moda.space/ingilizce_altyazl_film_izleccked.pdfIn PDF document text
    • http://wordwild-store.com/98388631966l1px8.pdfIn PDF document text
    • http://6gusevshop.space/halloween_coloring_sheets_for_adultsick3z.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/gjcWjea/85155112126.pdfIn PDF document text
    • http://otomail.business/bcs_online_form_2018votk9.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/anomaly_2_1._2_apkitq8t.pdfIn PDF document text
    • http://comp-arenda.site/one_punch_man_a_hero_nobody_knows_garou_dlcxq7wn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jusiwanemil.epizy.com/57623022933.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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5292 bytes
SHA-256: 6e20c953502c7d06cea30876d4732726c41da107988c1804ff8314e0356ff2a2
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 10544 bytes
SHA-256: 43e17347ad8fea6e4ad3e9f5417a183b434b55af7a2ed225d23468733c38bba1

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