Malicious PDF — malware analysis report

Static analysis result for SHA-256 540e7c9bdc06bfe7…

MALICIOUS

PDF

89.8 KB Created: 2021-04-07 05:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5f18282c9919273f712afd3188504c7a SHA-1: 21377af292f6435bf5fa5cb0e85f4d939d009130 SHA-256: 540e7c9bdc06bfe7700cfb8ef10e4722feb291189e06eee4940a45e9ec94998b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, specifically for containing a large number of external links forming a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded document body text is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=android+development+kit+download+eclipse In PDF document text
    • http://fb-ig-copyright.com/20711539213xel4j.pdfIn PDF document text
    • http://homiak.fun/66271173494rhtcw.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/balunapigodi.pdfIn PDF document text
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/tasobosofikokaru.pdfIn PDF document text
    • https://vimitorumu.weebly.com/uploads/1/3/0/8/130814921/45bd593e9a619.pdfIn PDF document text
    • http://ilkertr.shop/jijajuvujoledigemig1jx6.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/8081166.pdfIn PDF document text
    • http://2020coupons.info/458121327271wl03.pdfIn PDF document text
    • http://fb-ig-copyright.com/fizasomaguluo54z.pdfIn PDF document text
    • http://polfact.site/58712900706by0v1.pdfIn PDF document text
    • http://remontnatali.ru/why_would_my_dryer_keep_shutting_off0yfe9.pdfIn PDF document text
    • http://haifaiv.ru/bach_chaconne_sheet_music_guitarkt47c.pdfIn PDF document text
    • http://optalpha.com/78679347033xuj92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_5ff7135b68092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413239/normal_6054673dc0684.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/10da61a4-ff6f-4c90-8f4b-5b159f8161ad/united_states_constitution_scavenger_hunt_the_articles_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e03a0c-57b6-43aa-99b8-e7cd120387e5/31411496261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9491546-e00d-4899-9e88-7b0776101076/vakixamozobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5811f81f-5e42-47f7-976a-dcd25a36c5ef/79817489031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62c1770-5cbf-4f19-9333-753f5e4842fb/examples_of_professional_development_goals_for_project_managers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 5212 bytes
SHA-256: 8ae1348b9f72f6ddf41d6adc07385349e47dd8d4ffa2e3dce82c31231bdf65ff
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 10956 bytes
SHA-256: e7fb975023942b89790e791cc408e1b1bb004ff03b17b83d028e7fb1c474889c
font_02_sfnt_off00013427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00014955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14955 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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