Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7f6aec21e4964c…

MALICIOUS

PDF

74.3 KB Created: 2021-03-05 18:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d1b4f7859c249238c8c5fbf050530c14 SHA-1: d089c572e67763ddc2e6091b0328244900c155f8 SHA-256: 1c7f6aec21e4964c7d94d271322180ef1e2ea2df1d1a26b1e4c5e3eb259c0c45
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featuring a product search term and pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution attack pattern.

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://lozipotod.ru/wix?keyword=nostalgia+snow+cone+maker+walmart PDF link annotation
    • http://xtina.online/pozijhm817.pdfIn PDF document text
    • http://goloturasituj.66ghz.com/33242553881.pdfIn PDF document text
    • http://xojitufos.66ghz.com/21734777392.pdfIn PDF document text
    • http://vas-rem.ru/reportagem_revista_cruso_dias_toffoli40xz1.pdfIn PDF document text
    • http://getveran.site/video_gif_memes_pro_modzz3ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazatuv/8342908127.pdfIn PDF document text
    • http://gofemotomikuroj.epizy.com/60479767179.pdfIn PDF document text
    • http://zadedasex.epizy.com/13092890182.pdfIn PDF document text
    • http://gesinofafag.epizy.com/close_credit_card_account_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/serenissima_informatica_contatti.pdfIn PDF document text
    • http://pamajaxa.epizy.com/vitamix_venturist_v1200_costco_price.pdfIn PDF document text
    • http://kelawezup.rf.gd/folazaxibopexupomogujix.pdfIn PDF document text
    • http://fiwujugisijema.epizy.com/pediatric_pneumonia_treatment_guidelines_2019.pdfIn PDF document text
    • http://podatef.rf.gd/10180285343.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_b3eea6e6f1074e698992cb49cb2d2152.pdf?index=trueIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_c7aa75968e2f44c49df6f0e166751aea.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_54dd74f50eb04a31a5edee62acdd1ce3.pdf?index=trueIn 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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5244 bytes
SHA-256: 71a979f19bedabbee1ab3e8093d26b491da089ca96c045984192f6e2e34fb653
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10120 bytes
SHA-256: 0da5058d77708b922d402e75f08504d3b412b19929f91a341210cd1acf1fc8e3

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