Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbda4adb7c65c996…

MALICIOUS

PDF

76.1 KB Created: 2021-03-23 04:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5987ede9d0fd0dc000f40dce985568c9 SHA-1: 3454db2eb086b3b8259c0daf8c8ce6cd98e3741d SHA-256: fbda4adb7c65c9964c71bb7e873fe8b5e69c66cdf09b324831411c92650127d4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, disguised with a search query. Heuristics indicate this is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious phishing content. No scripts were extracted, but the primary attack vector appears to be directing users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=little+red+riding+hood+story+book+pictures PDF link annotation
    • http://rufejupewanun.iblogger.org/blue_book_aiesec.pdfIn PDF document text
    • http://rapukenafep.22web.org/22078599062.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/jidwhf3/xababo.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/geuj8ic/ganja_farmer_weed_empire_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/hgNXjbP/phone_games_like_smurf_village.pdfIn PDF document text
    • http://buxuzexutotuf.22web.org/62891981054.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/EigGhie/24600694269.pdfIn PDF document text
    • http://kamofetezadona.22web.org/the_americans_season_1_episode_13.pdfIn PDF document text
    • http://palejep.22web.org/43618185515.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/bulujono/15032148870.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_2279a38d64bb488caf9dc6a383f026ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26125a67-5a60-4de7-9201-54c07e0f3226/what_is_warren_buffett_investing_strategy.pdfIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_bb4ead1204094e7f804c059179f83e0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/carolyn_zane_book_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6349fb-b409-4b51-a36d-1b93303c426b/how_to_pair_beats_by_dre_powerbeats_pro.pdfIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_04fe64ceacc7481fa665dad6e7a26e86.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_63a2ae25ece04c7e86a53eb02f81343d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a14485-0f55-43c0-b4ff-11f1892f513d/is_disney_going_to_stay_closed_until_2021.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_1c1371a6b5974235b22f9f1de808b485.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/53665331642.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_b481c3ae579a4ecdbcbbb5e0dd96cbc6.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_61c335eb0b7048ffa55e1ec0bfbb7f8f.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_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 5372 bytes
SHA-256: 88b9e1aa02dec0554caee26603d2a5c50ad0f35d809c95c8f60950fb7fed66ba
font_01_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 10916 bytes
SHA-256: a1fd1aceaa295dff62f903876a05e33ca6d84f9f1c78bfa94c559f88616733ae

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