Malicious PDF — malware analysis report

Static analysis result for SHA-256 e305a409b6a4846a…

MALICIOUS

PDF

90.4 KB Created: 2021-03-14 22:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d57bc30a0df8a42d771bc64dae497a7d SHA-1: 223133cbadfe6c1fb5957ef8e1230524faf9a915 SHA-256: e305a409b6a4846a2a7ae9d18349d3b95d9f6028b6bf1f8e4cf649302a03ee93
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable or suspicious platforms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that these links are intended to redirect users to malicious infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing or trojan-type threat.

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/wix?keyword=cheats+for+wizard+of+oz+game+on+facebook In PDF document text
    • http://creamwalls.space/49443235029hqkwh.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/nasixorajazuj.pdfIn PDF document text
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/tomevorufap.pdfIn PDF document text
    • http://italystore.pro/sex_and_the_city_2_cast_drama8ki1q.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/c7a93007664.pdfIn PDF document text
    • https://pefemodadiz.weebly.com/uploads/1/3/4/5/134520562/7229430.pdfIn PDF document text
    • http://jusolul.22web.org/crystalline_android_apk.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/1f88029f-c130-4ab5-b5f2-ae42427326bb/tone_infinim_bluetooth_headset_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9117120c-5c75-4a99-b0dd-a5620d2d37c5/end_of_course_exam_algebra_1.pdfIn PDF document text
    • http://mepojijolotezud.rf.gd/63523404325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc220a9b-739a-418e-8fd9-c680aa96e0cc/maruburitigemujikajugur.pdfIn PDF document text
    • http://fukorow.epizy.com/electronic_engineering_fresher_interview_questions_and_answers.pdfIn PDF document text
    • http://lazuvuvopa.epizy.com/19185603131.pdfIn PDF document text
    • http://renimip.rf.gd/xifeb.pdfIn PDF document text
    • http://wogakuw.rf.gd/jopudukerot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb44309-3de9-47f3-b505-f2aa1a148dcf/96736505529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e928b4dd-ba12-4626-9256-874a899214a7/what_is_the_theme_of_the_book_the_curious_incident_of_the_dog_in_the_nighttime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8030985-ff13-4d8a-883a-7ffa17a2d865/masterbuilt_pro_propane_smoker_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be40722-a59b-4818-8818-47b782b41382/fawiwumawefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d114b7da-4914-4262-a6fa-542b20024c80/heidegger_being_and_time_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b60bdcf-3512-4cfe-8a4f-2b85e7d54378/91485826836.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 5656 bytes
SHA-256: fe6c2cab9097d0d50aadf65e640f28de553dc7018ff40dde5eb6c35fc83af4f4
font_01_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 11424 bytes
SHA-256: 09f36c3ef192b650f87a18a6a004a8233bad4f316075ed50bb02c64577d1e52a
font_02_sfnt_off00014686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14686 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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