Malicious PDF — malware analysis report

Static analysis result for SHA-256 282d530ea55a878e…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 00:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8f398c9a6fa9db8a31478e3d1fdf9d64 SHA-1: bc20a02b8859d2f0c31941c2827d3a7c73a1ec24 SHA-256: 282d530ea55a878e39be6020a7f6467b4fffae31ba9dd01395dece92010f96e8
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to a domain associated with SEO redirectors and link farms, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure for "gas laws worksheet pdf with answers", aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/wix?keyword=gas+laws+worksheet+pdf+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fd67d1f584dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422884/normal_60030dee073ea.pdfIn PDF document text
    • http://workmonster.net/305724808793mlq2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_600b518456335.pdfIn PDF document text
    • https://wavamabixalovag.weebly.com/uploads/1/3/4/5/134525364/wolijexabe.pdfIn PDF document text
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/3418582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_603aad4e6e61d.pdfIn PDF document text
    • http://e-devletodeme.net/nolataxanuminufenewajareuv0dk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_6033ba74e929a.pdfIn PDF document text
    • http://ketosimple.online/984057789347w1ix.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/gaxuremewuger/writing_an_abstract_in_apa_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/shooter_games_mac_os_x_free.pdfIn PDF document text
    • http://rawozenagi.epizy.com/39416627939.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/the_vampire_diaries_logo_svg.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/android_studio_linux_minimum_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/dremel_3000_multi-tool_set_set_of_25.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/berea_technical_college_information_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/hankyu_hanshin_holdings_annual_report_2018.pdfIn PDF document text
    • http://loxexezusus.rf.gd/xelumesefudif.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/jewelers_mutual_insurance_company_annual_report.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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 5316 bytes
SHA-256: 69972b4f841fd0cb0428e33d58ff4678784b5d6b7560b2b11001bef2376ff782
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 10296 bytes
SHA-256: f88ded3c5276aa6c4f4b126f3a30d0091135b11e0125a17ed600a57366bbfd09

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