Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6efb1dc1702f736…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 14:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 33389f683ce48700a59bba08d9b5b61d SHA-1: 1a01ee5d7eeb11542a5f17e9ee517a986411dae4 SHA-256: f6efb1dc1702f7367ea33e1e7f0d8f9e48dbc571278150a0c0d271081a2789c2
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains embedded URLs pointing to potentially malicious domains, such as 'botokaw.ru', which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest it's designed to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/award?keyword=voltage+regulator+using+ic+723+theory+pdf PDF link annotation
    • http://dvestideyli.xyz/mcgraw_hill_education_answer_key_world_geographykmm9o.pdfIn PDF document text
    • http://mishabelle.ru/78016114958nf1c3.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/cieghtg/33947028177.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/sjgij0V/kumufonumifaropoxote.pdfIn PDF document text
    • http://waystep.site/fitivalunamalizuvedanuevvnv.pdfIn PDF document text
    • http://chisto-chisto52.ru/nutrition_care_plan_for_gestational_diabetes2bkrs.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • http://venira.su/electronically_supplied_services_a_guide_to_interpretationaqbct.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/3ff070c3-e021-4bb0-aa6b-e5471dac1ab9/zofejigurogut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df721b5e-74bf-4616-a61f-cac424080db7/wapujin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f029f3f0-f634-4cd2-b1bb-80d750d7bddd/hp_deskjet_9800_lights_blinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ae5be7-0a47-4d1b-b815-ebedb7417c07/free_downloadable_math_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30f64d6-702f-4614-8303-f5923ca5aae1/why_hp_envy_battery_not_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/famor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abaee51c-8283-421e-b3b7-bb6b17315077/the_time_travelers_wife_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e4d2ac-9bad-46f2-b948-6afe0a701a99/1307576058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23da8c6e-dc42-472a-ae3b-744c7eec073a/7083488222.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/videos_of_monster_high_dolls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c3ad74-d552-4a75-a937-6d46c4113908/rijilodiximaxoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c012d98-49f4-4cc3-8f83-8cc46237966e/ariens_snowblower_manual_624e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904afb15-4818-484d-b49a-feac697b06d3/mokusiburunafupup.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/45958088696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00618ada-8ec3-440f-8f64-eebce54771bd/how_long_do_california_roll_sushi_last.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/hackerrank_test_questions_and_answers.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_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 5860 bytes
SHA-256: 1270435180ab948e04ab8a4cc134368867046b42246c3e5290795815cd12ff7a
font_01_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 11004 bytes
SHA-256: 93f6d5a5320dd957b607605e756426827853022b5e172985a5dc1aec0088ce56