Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34a094ae5267d28…

MALICIOUS

PDF

76.4 KB Created: 2021-03-22 14:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c779f4bdb175dfcc2c24352220f0a7af SHA-1: 0551e3cfccb64b44343695bdf5cfbb31803dff10 SHA-256: c34a094ae5267d28fe432eea96afe163191a51961af0593b81b5d8bd3031d75c
156 Risk Score

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 and by an ML classifier with high confidence. It contains a large number of external links, many pointing to potentially malicious domains, and one specific URL, 'https://maypoin.ru/aws?utm_term=%252840+lessons%2529+basic+english+grammar+rules+with+examples+sentences+pdf', is identified as an external URI. The presence of numerous links suggests a link farm or phishing attempt, aiming to direct users to malicious content.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/aws?utm_term=%252840+lessons%2529+basic+english+grammar+rules+with+examples+sentences+pdf PDF link annotation
    • https://cdn.sqhk.co/kizusuvut/hiejjje/tukaditefozijinavegapirap.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/girijC5/photo_editor_online_free_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/dorMiaP/bounzy_all_spells.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/Zjggeja/jigobawukewisamod.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/Lihieie/rusaxojeza.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/SMIjeLg/sputnik_2020_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/gihxhfQ/98387964391.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/donarepemi/boreal_forest_information_and_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbe6893-233d-446d-8420-6afbe9bd685b/star_trek_enterprise_episodes_ranked.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/motionless_in_white_disguise_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/task_8_browsing_through_journals_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/46001180258.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/what_foods_are_gluten_free_at_starbucks.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/how_to_gift_wrap_a_cube_shaped_box.pdfIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_18d9e6776cd04688b21dc45ac7c8457c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/sony_car_door_speakers_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f325b0-fad5-42bb-99dc-d0268abb1187/que_es_una_foto_impotente_o_impotentes.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_131c4dee71c645e4b5b7fa0a8eccc37a.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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 6156 bytes
SHA-256: 9c5822fd29c295debf7c0e338038f69c40e08b836ad4c41d6bc72ac306b032e9
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 9616 bytes
SHA-256: a2d2d7100e4faf1d357d1fa415b7d202cb015bb5d5bf9d49ebfe2e8a6093bfcb

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