Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dec7e1aaaa1a47…

MALICIOUS

PDF

103.4 KB Created: 2021-03-20 23:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e47c6941a12769ea5a97f8eaf3c8730c SHA-1: 568c21268fa65aa16959cc1741d13d78eaef2324 SHA-256: 53dec7e1aaaa1a47fdae6494c05bacd386efb45d7e9594a28f91dd21dabfd903
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 0.9995

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://leonvi.ru/strik?utm_term=call+of+cthulhu+7th+edition+review PDF link annotation
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/409342581438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451762/normal_5fc7be8083e64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5fef0ff887d27.pdfIn PDF document text
    • https://koniwosusuzese.weebly.com/uploads/1/3/1/8/131856176/zisijovodasajek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5fc95f63125f5.pdfIn PDF document text
    • https://givenuwijuzi.weebly.com/uploads/1/3/4/4/134445792/7906842.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/8e235f.pdfIn PDF document text
    • https://zibubelufi.weebly.com/uploads/1/3/4/5/134517595/wajilujibosobuj.pdfIn PDF document text
    • https://xoxitugupara.weebly.com/uploads/1/3/1/3/131383959/vivugan_logasisafodujes_binofegizubo.pdfIn PDF document text
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/bb74ae.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/vuzitalepikupuz.pdfIn PDF document text
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/zadalijeroravux-woviko-didin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454803/normal_5fc9cc171c79e.pdfIn PDF document text
    • https://vasidigugadojo.weebly.com/uploads/1/3/0/9/130969577/2df9aa1e3087.pdfIn PDF document text
    • https://jerofewu.weebly.com/uploads/1/3/4/3/134369167/kodalowufog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a58c2d-8d51-461a-8d43-b789b6246251/tigoxufulomodoparokew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b8741c-e275-4348-ab08-dea109146c43/sogawamadoteluwolib.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_6c4b4a1aea1c44689779662a08b0805e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffd4a5a-cafc-41e1-8779-ab6cebaed93d/19660299797.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_9411c404c03a469a8d75d09dc336d0f6.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_505d4b1dc80642caaf07caf8ec8a7cb6.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_ecb49e0a94d94d2e97c0fff5652e727c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6d235f-6090-4425-aa64-7803858cf020/bubunelofomolul.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_off0001576f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576F 5068 bytes
SHA-256: d71e6d8012a058a78235924ef363cac359a5a12e39853cccd73c08a9064892f3
font_01_sfnt_off000168c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C3 11848 bytes
SHA-256: 98613b42c18f45415e6d60558f4378ef2884289bca81d6ef6084d4e9d732f697

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