Malicious PDF — malware analysis report

Static analysis result for SHA-256 48317cefb45b4210…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 02:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ad749c82e7f87cd6603c21d8b2eb8975 SHA-1: d08e71b49c9c052001e43be3918b0820e69bf5a6 SHA-256: 48317cefb45b4210bfaafad025b39c275f5dd14b11344146e679b79f2ece086a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it contains external URIs and is part of a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'maths functions and graphs', likely a lure to encourage clicks on the embedded malicious URLs.

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://jumiwimov.ru/award?keyword=maths+functions+and+graphs+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450156/normal_5ff5f108a6eaf.pdfIn PDF document text
    • http://eferevole.com/zitukaxmqwdl.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/ahfgdIg/62193741356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_603e3b5ac8fc5.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/fjhVACC/skipping_rope_shop_near_me.pdfIn PDF document text
    • http://rorezorejadij.iblogger.org/bethesda_system_for_pap_smear_reporting.pdfIn PDF document text
    • http://bufo.online/bisadeduj8pu9q.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/his4ofe/baseball_card_scanner_software.pdfIn PDF document text
    • http://ilook.market/faxafunovezawijawifjo17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5fc791f716823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/360d37d5-a8a1-44bf-9c78-0678db42d514/38642731078.pdfIn PDF document text
    • http://sedoguzod.rf.gd/pisoturobivutedejezumat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0947d77-12ec-43f3-bc6f-0041aa03e8fe/is_the_mini_14_a_good_shtf_rifle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c5d2e3-c5b6-4bc7-8ac3-ea0b8aa0096c/zizazuredeferir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22beb78f-3da8-44a3-b164-e45999da191f/what_the_bible_says_about_drinking_wine.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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 5388 bytes
SHA-256: 4a0a58d6c8cce8511e0c2bd9a21389112da0188447b88de5d78c292b40fbceaa
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 11088 bytes
SHA-256: 0df950f94893fe8cdf78bc37a2585cce19f0d4d5c3b652178db22fb5cd4e6cee

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