Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba3c8d518a33827…

MALICIOUS

PDF

79.2 KB Created: 2021-04-04 10:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1ec5bb2e057f389b44368256cc0e4cc SHA-1: 8476a8d4113261c5881108a0fdb744234eb8ccd4 SHA-256: 9ba3c8d518a33827fbf96d175369c3d1c8035cce736f99f58021d2513af81a37
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to a download for a 'browser with built in vpn apk'. This, combined with the ClamAV detection and ML classifier flagging it as malicious, strongly suggests a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for such lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/123?utm_term=browser+with+built+in+vpn+apk
    • http://tefuvawilutir.mypressonline.com/upsc_mains_answer_sheet_for_practice.pdf
    • http://janafan.scienceontheweb.net/aptitude_test_free.pdf
    • https://cdn.sqhk.co/fosuzonarefi/4jihbrp/kitimapejomufuzefarifebej.pdf
    • https://cdn.sqhk.co/linotepibubi/niauGjj/firefox_versi_50_32_bit.pdf
    • http://bellissimo.online/strong_father_quote3gluv.pdf
    • http://wuzoxisazatik.22web.org/value_of_roses_book.pdf
    • http://top-odejda.com/79415968340qp0yf.pdf
    • http://mejumafegebameg.mygamesonline.org/90887985734.pdf
    • http://fastcreditreport.info/42270478874ugqls.pdf
    • http://zokibijefepixit.22web.org/97657139931.pdf
    • http://logekolumo.22web.org/bevutunoviwubesejagir.pdf
    • https://cdn.sqhk.co/rapurakoke/pv6jfib/slice_of_life_romance_anime_crunchyroll.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1c83e413-c5d2-4db7-9dfd-bd260cbdd102/xevolixof.pdf
    • http://vupaguriwedizid.atwebpages.com/90509882806.pdf
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_54629cc58c154d6389cc29cdc59f117b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/74885116-b0c8-4450-a667-3b9dcb91b1c5/2.1_blackdecker_40v_max_cordless_hedge_trimmer.pdf
    • https://uploads.strikinglycdn.com/files/8eb007ab-da86-498a-8ccc-bcca4d20bd2b/what_is_the_sandwich_technique_in_writing.pdf
    • https://uploads.strikinglycdn.com/files/eb57c1b5-b537-4337-804f-d46eba64080d/81859307278.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_0acfb4c3f766419b9175748dfa4a140a.pdf?index=true
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_5176be9bbf1540fa99d2c27303e737a3.pdf?index=true
    • http://fizufanotujo.epizy.com/47776867719.pdf
    • https://uploads.strikinglycdn.com/files/47b67a96-2663-4726-8633-a69c09fe938e/53152134431.pdf
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_b5865fa2314f47f89e5be9dd193aa099.pdf?index=true
    • http://kumodifusimut.epizy.com/ultraviolet_absorption_spectroscopy.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f786.bin
10989c2ce0e0e44e173f997a2b5362547be4d633d4372490f5e4d3daaf09c17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 5312 bytes
font_01_sfnt_off000109a0.bin
7bb64c09b70de24691ce389f7ebea23eef816f9e0de91119c5edf4f870a7b302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 11132 bytes

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