Malicious PDF — malware analysis report

Static analysis result for SHA-256 4065d5907589ba83…

MALICIOUS

PDF

78.8 KB Created: 2021-03-22 05:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f03a6c6345520c8a980fbeb9d3c783e5 SHA-1: 378bdccdbef194fa8b0119dab6715112842fb057 SHA-256: 4065d5907589ba836df0b380307dba874bd8c8b991ad37e34d25fc4e1be27d07
186 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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=developmental+psychology+exam+1+study+guide PDF link annotation
    • https://nuvitofoje.weebly.com/uploads/1/3/4/6/134640236/87df93d7125a8.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/fJbshii/game_creator_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/butexuvokufo/gjeigdm/72332018880.pdfIn PDF document text
    • https://wipiduwofudozi.weebly.com/uploads/1/3/4/5/134588456/golirijadezilixamete.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/lonuzujagulikev-tuzivasum-kesagijarebod.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/wonuxavigalem.pdfIn PDF document text
    • https://cdn.sqhk.co/narivujuraf/hp54ibn/cake_design_simple_video.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/jfExjhx/little_foxes_spoil_the_vine_kjv_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/mapasabezefiwiputen.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_8435cb721d314ca5ac98373c2a85c34d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa6dda3-ba0d-4b57-a6ec-84bb74569e6c/to_be_a_slave_book_summary.pdfIn PDF document text
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_4e584d10f9104479a65c6496bccf78c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd554a79-717e-4e9d-bfd2-5b12e43c5952/zasipidisewuvadeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45373592-bb59-4f5c-8503-1dba4ef6f10f/nadirikerepabopapobofok.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_c735771fb2af456eb83a0ebc391c947f.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_ac836dbe2df54b52ba46b3c003e68f64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2993925a-7ae5-4a9c-a53d-f54114895901/is_easy_peasy_lemon_squeezy.pdfIn PDF document text
    • http://niselasot.atwebpages.com/sejarah_politik_sabah.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_a5b3a80976034f7eb7ccfa6c355d1674.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_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 5672 bytes
SHA-256: d155a09dab7427a0966eea9839efed336bf812a7c580e800fcf7c51b4ee0914b
font_01_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 10484 bytes
SHA-256: 80ecc455750bd62cf50cea7f6d9a167188d489a20ea7e8d19ad606debfdb1454

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