Malicious PDF — malware analysis report

Static analysis result for SHA-256 334eb4908651d534…

MALICIOUS

PDF

95.0 KB Created: 2021-03-21 03:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 960335ce699a4018fa992cbd16635e49 SHA-1: d9aabc8f253dc16c3729fdcc448bef7e35f26b8e SHA-256: 334eb4908651d53489803239870c75b6c748ac9e8b5a8d3c74e31cc4f8e8d083
196 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure and a link farm, with a primary URL pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a 'worksheet answers' theme, aligning with common phishing pretexts. The presence of numerous external links, many pointing to S3 buckets, suggests an attempt to distribute further malicious content or engage in SEO manipulation for traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://seumenha.ru/wix?keyword=lizard+evolution+virtual+lab+worksheet+answers PDF link annotation
    • http://dream-stat.ru/40258282276eoxp.pdfIn PDF document text
    • http://guitar.su/direwewaiqv5b.pdfIn PDF document text
    • http://gelchlen.fun/lg_inverter_direct_drive_washer_tub_clean_cycled1lij.pdfIn PDF document text
    • http://russianpatentexpert.com/868822710719zdsd.pdfIn PDF document text
    • http://shopbest.online/lenegibaroje6t6k.pdfIn PDF document text
    • http://jitokinut.iblogger.org/yahoo_mail_manager_free.pdfIn PDF document text
    • http://hookup750.website/naruto_shippuden_299zb4iq.pdfIn PDF document text
    • http://kernig.store/background_editing_png3ysoc.pdfIn PDF document text
    • http://malespw.xyz/74220718539ya9t8.pdfIn PDF document text
    • http://didifofovura.iblogger.org/cfd_analysis_in_ansys_workbench_tutorial.pdfIn PDF document text
    • http://cloudplay.xyz/chakravyuha_movie_naa_songsq9n53.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/zafijukopa/acrobat_vip_direct_link_adobe.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/fusakugefenaf.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/stares_angrily_crossword_answer.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_39af5a60fe554e94a5bd8f391f85b7e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/28392449879.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/ma_am_plural_form.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_427cfcc20846417f8914354d1af35e70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/51716986141.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/samsung_washing_machine_support_repair_center_in_mumbai_mumbai_maharashtra.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/measurement_worksheets_grade_5_free.pdfIn PDF document text
    • https://f33eab34-52c4-4f1b-91c9-7c5ec1255b8f.filesusr.com/ugd/9d0374_098746eea07249358e92fd2f60e28b41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogonof/indirect_questions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/27688765413.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_f4d5ff8e76d3496e8f6ac48b70972a7c.pdf?index=trueIn PDF document text
    • http://zumosupol.epizy.com/the_norton_reader_shorter_14th_edition_ebook.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 5260 bytes
SHA-256: 6ca2d946e5c29f03411d16b68e5e7b3f055bae2c406815224cbb1ea9a1751bc8
font_01_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 12064 bytes
SHA-256: a17e2fd57612341c708b96439a87f079759e03b4459e2d4c0ab4818cad41ce3c
font_02_sfnt_off000157da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DA 16208 bytes
SHA-256: c286131fd4aa28075b5e406c559e01e688b1a0c136de28944d919ba4dcdd9e4b