Malicious PDF — malware analysis report

Static analysis result for SHA-256 a375e1def307a423…

MALICIOUS

PDF

83.9 KB Created: 2021-04-03 20:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a55ccf9ac569b238deadef0e54456afe SHA-1: 7971f7052452247a34d090df64e6ddd5fde16f79 SHA-256: a375e1def307a42315ae850cdb627c740540c5a006bf0960cb952a71f123df46
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a ML classifier and ClamAV, and exhibits characteristics of a link farm. It contains numerous external links, including a primary lure URL related to accounting interview questions, and a large number of other PDF links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://ponafet.ru/award?keyword=accounting+interview+questions+and+answers+pdf+download PDF link annotation
    • https://cdn.sqhk.co/xidosisew/jizhjwv/voice_recorder_download_free_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/munuzimevu/zpRq7jd/70899955149.pdfIn PDF document text
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/jodeta.pdfIn PDF document text
    • https://wujojebexubab.weebly.com/uploads/1/3/1/3/131380870/maratojufo.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/1nieiio/wapejuwigusatubab.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/hdhbigQ/66316264979.pdfIn PDF document text
    • https://jasevumoxemu.weebly.com/uploads/1/3/4/7/134707335/baminewuvo.pdfIn PDF document text
    • https://dotepeguga.weebly.com/uploads/1/3/4/6/134684910/1b01f6391dc7.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/Zgficje/looper_movie_review_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/dujuxafetot/g1Cgcie/pulsations_king_of_prussia.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/Hgfahgy/interstellar_cast_imdb.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/galinikagopit/titoraniruselit.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/ashley_furniture_platform_bed_sets.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/the_makers_diet_meal_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/gods_of_olympus_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/the_candlestick_course.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/kaleshwaram_project_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/auto_format_xml_in_notepad.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/dell_latitude_e6540_i7_radeon_16gb_ram_512gb_ssd.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/copaxone_start_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/4869078101.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/wibafunuledotijirid.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/84596400313.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_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 5592 bytes
SHA-256: d893d575537deb7686e61b3fdd9f6bca5d7f5f5e895b77c18371109ce474f173
font_01_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 10544 bytes
SHA-256: c492ec1f74cda987e24bcc6e47baae5f148b26613b7d7ac97def5d94fa70ea11

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