Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd876a0186b07e9…

MALICIOUS

PDF

77.3 KB Created: 2021-04-18 12:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1f8a8098f0796c7f8c7e15bd781896c5 SHA-1: 2094128190add2056b9d655be68cd6f726fd066b SHA-256: 9fd876a0186b07e9f0835bd7fa1d68224861c46437d10501ef9ce475040f4d25
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a significant portion pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates tracking or campaign-specific lures.

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://golowaki.ru/strik?utm_term=is+diary+of+a+wimpy+kid+on+amazon+prime PDF link annotation
    • http://lilubaxubaxulu.sportsontheweb.net/memoda.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/77249269192.pdfIn PDF document text
    • http://bimadepunepi.mypressonline.com/96066000706.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/77382809778.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/ges_cost_accounting_syllabus.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/gagitujivulit.pdfIn PDF document text
    • http://zagodutaf.getenjoyment.net/uses_and_misuses_of_internet.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/anoreksiya_nervoza_nedir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fajesunuk.rf.gd/how_to_do_self_cbt_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755836b6-02b8-445d-8ac2-e6729c76d3a4/faxinuzonomib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c072b50b-920a-44bc-b0da-430eb41d119a/45046767456.pdfIn PDF document text
    • http://telifujovemevo.atwebpages.com/vezewab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8589e74-3802-4815-a92f-1f6ddb3eae86/how_to_open_a_sentry_safe_model_v330_without_combination.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/24112292869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82989b3-86ee-4876-b79c-2308b3692a96/twilight_saga_new_moon_plot_summary.pdfIn PDF document text
    • http://taguloxutenafol.myartsonline.com/16086671552.pdfIn PDF document text
    • http://wesakuboviku.epizy.com/berliner_platz_neu_a1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1233c745-a4fa-40e2-8b82-09e49808ac13/the_twilight_6_saga_midnight_sun_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/bobegovinevefotomopenazok.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_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 5400 bytes
SHA-256: 007b6c82445e65285051e3b8d8256b57e34445e07c7b2016cdd03356f3cbe665
font_01_sfnt_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 11344 bytes
SHA-256: c3ed0f6ad109c45c7d1ea8d40321dbcb0df5c01f6ed1b279fdb156cffca36f0a

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