Malicious PDF — malware analysis report

Static analysis result for SHA-256 87678c8d2d28f2cc…

MALICIOUS

PDF

70.8 KB Created: 2021-02-06 03:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cad428a49218cafcff5f1d676abc3ef5 SHA-1: 75b36e9df4d1d7d8907619eda2bd1346c1fccea1 SHA-256: 87678c8d2d28f2cc96ad9060baf26b417b7ad40d1ca4e13bf2fde766d800f9fd
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV both strongly indicate maliciousness. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

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://jacksth.ru/aws?utm_term=darn+tough+socks+sizing+guide PDF link annotation
    • https://ruvezidarumova.weebly.com/uploads/1/3/1/3/131380493/virevonutezisoj.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/jefev_tajamakenelise_pasamikususuduj_zuzajib.pdfIn PDF document text
    • https://laxedojopepab.weebly.com/uploads/1/3/4/8/134896069/a53d440533.pdfIn PDF document text
    • http://passive-income.ru/zombie_army_4_dead_war_pc_gameplayzd327.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/9519329.pdfIn PDF document text
    • https://benowanazopawa.weebly.com/uploads/1/3/0/7/130740092/deroguzotenaserad.pdfIn PDF document text
    • https://foxaxefaga.weebly.com/uploads/1/3/1/3/131398491/6f22d8.pdfIn PDF document text
    • http://secret-empire.ru/harry_potter_and_the_cursed_child_doo1h2e.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/2259593.pdfIn PDF document text
    • http://shopee24.site/rutisevugujvwp72.pdfIn PDF document text
    • http://hamlikjorettoop.ru/40099409938bd4i9.pdfIn PDF document text
    • https://kofekatemate.weebly.com/uploads/1/3/2/8/132815318/6473033.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifesu/95443363802.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/mekarizafavezexox.pdfIn PDF document text
    • http://nanamiw.epizy.com/google_form_header_template.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/tovofawijexulifida.pdfIn PDF document text
    • http://nerelikeg.epizy.com/seven_deadly_sins_anime_episode_guide.pdfIn PDF document text
    • http://solukirakologi.epizy.com/15977284403.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/47557915909.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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 5280 bytes
SHA-256: f0c5e738c6bd8408163e25e0e1312290c66b7a2e07e6e05a9b9d7ea11b46c7ca
font_01_sfnt_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 10748 bytes
SHA-256: 0df52d64e0957cb0d80fbbe76067a5eea68dd161299768b24e6aa53520fc3c09

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