Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5be0a01c6b368d8…

MALICIOUS

PDF

78.6 KB Created: 2021-03-16 05:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16de690b7a1e449e42bca1de4ce3d1af SHA-1: 15630b9de8b6a6183d538c9312ac384032f80f53 SHA-256: b5be0a01c6b368d85951e8ca5b402aaeff7ef4560293056cf4f28c6aadb2ab22
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xezojetit.ru/wix?keyword=systems+of+equations+worksheet+substitution PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384820/normal_5fcaf59f2bc29.pdfIn PDF document text
    • http://zyzycheat8.xyz/tonamiresizukopexuxiswri1.pdfIn PDF document text
    • http://sallles.ru/uad_apollo_twin_usb_price_in_indiacsjtf.pdfIn PDF document text
    • http://55571.ru/minn_kota_ultrex_112_us2_trolling_motor_w_i-pilot_storestqjop.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/62956900047.pdfIn PDF document text
    • http://fridgeservice.ru/how_many_covid_cases_in_mercer_county_wvxur7m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5fdf718131bd5.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/wasabosupuwig.pdfIn PDF document text
    • http://detonicufficiale.website/39050974953a3x6y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_129d501cbc9843a98861e0990ff8659c.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_51c0da2d26ae4faf903df1f6d6e9c7fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifamomove/formal_word_for_love_life.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_08208a5840bd4918aa8a7d776bde9ae0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kafises/bastards_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/59028019101.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/wifi_hotspot_software_for_laptop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/3852438793.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_ebd84b1d9fa54073977a840b2e5d5075.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_a2a52b2921534f6ab525d0f11f312814.pdf?index=trueIn 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_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 5600 bytes
SHA-256: d6841cd458b521fcd541217375074c6c69d415d604ce635d01a68d64503cd4c0
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 10864 bytes
SHA-256: 73af94be19e8d4e71d9b56d98aeb7fdfb6413c7560f083e4015fec362a93bbe0

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