Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d1122ad5b4918b…

MALICIOUS

PDF

77.1 KB Created: 2021-04-29 19:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c6cb53b97217285e2693cf5eb178374 SHA-1: 2297fb25d10e90c248d052bf9024dee5751bc020 SHA-256: d6d1122ad5b4918b60cd5fefea87fa7b0f2bfa0b9136ccfdc6eb4411d3983fae
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized content, indicating a link farm or phishing lure. The primary redirector URL, https://resalured.ru/strik?utm_term=what+are+some+speech+therapy+techniques, is associated with a free-download phishing scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://resalured.ru/strik?utm_term=what+are+some+speech+therapy+techniques PDF link annotation
    • http://lnstagram-blue-ticks.com/minecraft_how_to_tame_a_llamatl0s3.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/8487099.pdfIn PDF document text
    • http://complerbnp.com/printable_bubble_answer_sheet_1_10065pyx.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/nigunejokopex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402951/normal_60068cfb500ed.pdfIn PDF document text
    • http://my-favshopd.online/33926499188f9f8w.pdfIn PDF document text
    • https://voxalasodakuro.weebly.com/uploads/1/3/4/0/134042561/dogamuvinom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_60494fb4b25ae.pdfIn PDF document text
    • https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/fc50015123f2.pdfIn PDF document text
    • http://sportita.fun/78099383509sjz2q.pdfIn PDF document text
    • https://voresefum.weebly.com/uploads/1/3/0/8/130813922/3659150.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/timeziso/juvunogomunejonuvob.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/63201086199.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/age_of_enlightenment_crossword_puzzle_answers.pdfIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_bef02912ad104186bb93e7bd43499f01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/what_is_native_american_heritage_day.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_6f67cec6c81f417381547051b0bfafbd.pdf?index=trueIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_5f51ffb447af48cfbc653d1111a2cc2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxapoz/screenplay_character_development_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/how_to_provide_cognitive_behavioral_therapy.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_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 5380 bytes
SHA-256: 6d05c6b033d8ce77a5eb554c4df9a0ee38c634948f6e4526e8940602b988ba20
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 10124 bytes
SHA-256: b86be66817af390813adec49343df4f4710b023cf0c3e3d7cbae3a1e9d258b24

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