Malicious PDF — malware analysis report

Static analysis result for SHA-256 99786e339825b14c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-26 04:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f12f62f8d7dca440828286b71d6c9ff7 SHA-1: 0f8af60d96536de2d9bcb2586c8e85e1dace9222 SHA-256: 99786e339825b14c95a1a181293ded54b898d143cfa9d5138edc6bae36e1aa28
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms used to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the intended function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/aws?utm_term=garmin+astro+220+with+dc+40+collar PDF link annotation
    • http://juluzenaluziwo.22web.org/dagibijejamikigoguduze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464313/normal_5fd09451363f5.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/hdEdNOZ/tasty_blue_full_version_download_android.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/9209530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_603430585f6d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_600751b6b43c0.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/h2iicgf/vrchat_active_status.pdfIn PDF document text
    • http://wuwulobuxalajut.iblogger.org/43219509360.pdfIn PDF document text
    • https://femezusuf.weebly.com/uploads/1/3/1/6/131606597/nusaj_mipul_ditoribo_luwojex.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/2336745.pdfIn PDF document text
    • https://sirususi.weebly.com/uploads/1/3/1/4/131407567/4172657.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/42a1f69f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5fee8a0ca27f7.pdfIn PDF document text
    • https://cdn.sqhk.co/sapasimemo/ifHY5gi/quest_town_saga_mod_apk_unlimited_tickets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavejanunar.epizy.com/achieve_ielts_test_3_listening_answers.pdfIn PDF document text
    • http://gunexukod.epizy.com/what_are_some_of_the_characteristics_of_the_hebrew_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0724631b-0dce-4a94-bebe-f589fdf21bd7/57709216751.pdfIn PDF document text
    • http://zosusakadutadi.epizy.com/rikejexezir.pdfIn PDF document text
    • http://dijemawijopetu.epizy.com/67113475343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7973a660-8dda-48bf-93b5-5d04bdaf0132/dixie_chopper_zee_2_54_for_sale.pdfIn PDF document text
    • http://segenuf.rf.gd/88044421112.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_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 5664 bytes
SHA-256: 9e185e7c47f4efee9ae1df994215f73ee60efd4ff27f1eb6ff1e742b548d4f59
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 10988 bytes
SHA-256: aa873789b5a326cdd8942d538a73840740082958d1f84642729b680c6dee7709

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