Malicious PDF — malware analysis report

Static analysis result for SHA-256 445d799a9f80787e…

MALICIOUS

PDF

68.7 KB Created: 2021-02-28 03:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c28884779a8e807db74906910d860867 SHA-1: c6f0c4dbb7af5422eb75291f696e1041c9a003b0 SHA-256: 445d799a9f80787e6d80cb904928d52c7148060b5f034a7adb8abfad73594212
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to 'Skyline camper supplies', likely a lure to attract clicks to the embedded URLs.

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://resalured.ru/award?keyword=skyline+camper+supplies PDF link annotation
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/1232864.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/boxisades.pdfIn PDF document text
    • http://stickerrus.ru/nemofozejaluid14a.pdfIn PDF document text
    • http://tarenutufitox.66ghz.com/adm_apk_full_version.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/jasodafuxuzumus.pdfIn PDF document text
    • http://tehnoprom.org/vojodobnkg9j.pdfIn PDF document text
    • https://xotonibesil.weebly.com/uploads/1/3/1/4/131407892/lakomum.pdfIn PDF document text
    • http://specialsale.info/how_to_change_profile_pic_on_iphonexk26b.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/a730c.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/eddef361.pdfIn PDF document text
    • http://xasuxugadivusug.22web.org/xuloximugupisepediruwok.pdfIn PDF document text
    • http://larts.digital/jivozodorizetonotwjhyg.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/dhbhhgc/31242643502.pdfIn PDF document text
    • http://geniusenglish.space/understanding_computers_today_and_tomorrow_15th_edition5mlhg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/how_much_is_a_lash_extension_course.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/zoxevuxirulijezema.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/71491718157.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_off0000ceeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEB 5348 bytes
SHA-256: 817ef6a1fa44ce4c6334d99c572f15a9f68ebed5dd7d8ee6fdc36de41bbc317b
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 10764 bytes
SHA-256: 3251e61c0e47a4a8cae3f5dc888d313fd6d5b07f4be7bf1f454addb26760eb1a

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