Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c009ff33cd2964…

MALICIOUS

PDF

80.0 KB Created: 2021-03-31 18:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 86a1f213209561433a4b15f41fbf8f32 SHA-1: bb27af86c66baf2267125f7c1d55be4e81f8497b SHA-256: a9c009ff33cd2964ca0684bc9314ba8c9cb2cc30b5eee0a074f0a1ea10f8e602
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many of which point to SEO-optimized domains and redirectors, suggesting an attempt to distribute malicious content or phish for credentials. The embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a coordinated effort to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=what+is+the+best+car+battery+maintainer PDF link annotation
    • http://healthytrands.com/good_turtle_beach_headset_for_ps4owhan.pdfIn PDF document text
    • http://korsabarca.com/how_much_do_general_managers_of_restaurants_maken8kfg.pdfIn PDF document text
    • http://sadovik.me/the_harlequin_heart_of_darkness_quotescsq4o.pdfIn PDF document text
    • http://numberoone.xyz/traditional_african_drum_beat_mp3_download9b0cn.pdfIn PDF document text
    • http://dkblogin-de.best/78878765920th4o7.pdfIn PDF document text
    • http://pravagims.net/34156431718ca3kc.pdfIn PDF document text
    • http://xteenware.online/ue_megaboom_2_vs_boom_3yc0oq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_eb903971164f47549cc8663553391a46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/job_interview_questions_to_ask_at_the_end.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/fogafukevepotajumuxasuvir.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/pomefobegixuruxe.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/wd_my_cloud_home_4tb_portable_hard_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835a95d3-5935-46b5-892c-e1aba7070acd/vepodepoxixubokijakop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5c7e68-4ee2-461e-8e51-b09148fcdefa/shimano_di2_app_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/toyota_camry_2018_le_gas_mileage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d678ddb-1380-43a1-9939-190363ec7a86/gogijigovo.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/76874757874.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/behind_enemy_lines_movie_free.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_68e00585217b4215a8dcd12351c0ecbb.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_69332d57123949dbbc93bf29142e64e5.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_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 5264 bytes
SHA-256: 9f4aec2301d627d52b9b10be0c0913942777f5a61d507a2c0a9d91b1f5383809
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 10324 bytes
SHA-256: 0a67a248b9c7ea75f398d7ca2549d64a34e4ee8a445b3270c7d271c966a61248

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