Malicious PDF — malware analysis report

Static analysis result for SHA-256 8866cb273eb6c613…

MALICIOUS

PDF

110.1 KB Created: 2021-04-05 02:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9380187d6ae33dc3409dc906ea298487 SHA-1: a24727e02fb4e170b43b7282092cb78ab302a2d7 SHA-256: 8866cb273eb6c613a1c14e04b743e152461749408b1e75190f00ebd3c8efdef9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/award?keyword=divina+commedia+pdf PDF link annotation
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/dunikugebopazo.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/jbhejev/588086816.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/i0mjhyK/50892358008.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/fukalijinosudeguv.pdfIn PDF document text
    • https://cdn.sqhk.co/gotulurowav/ieij8Kc/54591614817.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/gHYhcc2/6684826424.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/numejujedogotaru.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/download_film_fifty_shades_darker_2018_sub_indo.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://s3.amazonaws.com/kewakuko/xawugonadej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd88405-4c46-48b6-a670-11e5cdd37570/suvegupilaso.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/87618480904.pdfIn PDF document text
    • http://rafodize.rf.gd/pavulovojijosanezunono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26fe6ae-852a-426d-b8f2-28fe552d8642/pizix.pdfIn PDF document text
    • http://xadujagi.epizy.com/le_bourgeois_gentilhomme_rsum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde8dd3c-16c5-4cb7-97d7-ad69125564ff/53864987332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63c43c5-d1cf-4cea-820f-aaf7f712df7b/how_to_get_summoning_jutsu_in_shinobi_striker.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/tupemilijipopoxutuwo.pdfIn PDF document text
    • http://xutevefe.epizy.com/gitedefadulalemek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095c7498-b4d9-4150-8b75-a13d4cf80305/lightning_thief_musical_cast_recording.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D0 4764 bytes
SHA-256: 8ad662a796c8a8d4b05439df06ccb7c6cbe87bdbcbb133aa71bdf1a39d7c9d79
font_01_sfnt_off000173e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E7 12780 bytes
SHA-256: 2cd5e46e090ff1c228ee3482216dec023bf04b6e36341b570d77dfc70a174fd1
font_02_sfnt_off00019c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C9C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c