Malicious PDF — malware analysis report

Static analysis result for SHA-256 f963a334e6ade399…

MALICIOUS

PDF

83.7 KB Created: 2021-03-22 17:34:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 39884d762fd29df6f3c59e9cd66a054a SHA-1: 9212a94154f2fcccf42b28fd191ac2e1c94fbb40 SHA-256: f963a334e6ade3995aefa53d1837bf7e334a79edd1b65ff81183f6335edd7757
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm and redirect to other PDF files, suggesting a phishing or SEO spam campaign. The primary lure appears to be a 'common grammar mistakes worksheet' which redirects to a suspicious URL. While no scripts were explicitly extracted, the PDF structure and extensive external linking strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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 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://seumenha.ru/123?utm_term=common+grammar+mistakes+worksheet PDF link annotation
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/zigisamaken_mupuzidodedixa_basox_xewon.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/99144891239.pdfIn PDF document text
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/99ac4.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/dc0b90e1d1b31e.pdfIn PDF document text
    • http://podifodosej.scienceontheweb.net/5_day_bodybuilding_workout_schedule.pdfIn PDF document text
    • https://zalozudipob.weebly.com/uploads/1/3/4/6/134673455/9497268.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/3630597.pdfIn PDF document text
    • https://lepenenaxagonu.weebly.com/uploads/1/3/0/7/130739126/lamosonibaveve.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/tokowire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vubuzixefixa.onlinewebshop.net/lokumipel.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/bijodukerovemukifejutidop.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/zezadefov.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/sioux_valve_grinder_chuck_parts.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_1c4b27de085f4362b739b30727832b54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunojipu/2594320217.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_f89c43fa8f6c470e89ed69de97475369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najipavez/23764032153.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/balance_sheet_of_tata_company_2018-_19.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_fbb5b2878c0346b095afebd32b63e60d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/xolopodemajunava.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/how_to_fix_a_computer_monitor_that_wont_turn_on.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_9a0f6a3ade1f4135b81e43e7cfbf546b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/sevana.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_0e13f6e1f0d3404f93dd5008afeb2b0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/blends_digraphs_and_diphthongs_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/connotation_and_denotation_practice_answer_key.pdfIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/40374599594.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 5036 bytes
SHA-256: 7fc6088cd03b5f25a470bace496cb2f03ee1a26b5ec66c03d415ef34ebca012f
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 11800 bytes
SHA-256: 1b597375525145d304810b8f097c06fc2c1d6d20e98a32aa2d49ddfc0a063c35
font_02_sfnt_off0001318b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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