Malicious PDF — malware analysis report

Static analysis result for SHA-256 82773589eea7e301…

MALICIOUS

PDF

74.2 KB Created: 2021-06-07 03:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 986ad00c13deb72cf18db9782508db38 SHA-1: ffe49342c0ee60d05a53121c0f6d50e122a774c7 SHA-256: 82773589eea7e3014cad583c9187e68af96e6ea521a4b127643678699bfcd685
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://wastran.ru/pbw?utm_term=iphone+ringtone+download+mp3+pagalworld+dj PDF link annotation
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/jugik_getirodufa.pdfIn PDF document text
    • https://nokiziwevapof.weebly.com/uploads/1/3/4/5/134507241/nuxorul-lamiwi-zovozulasotim.pdfIn PDF document text
    • https://redejopodudere.weebly.com/uploads/1/3/3/9/133999864/5807585.pdfIn PDF document text
    • https://nivasotum.weebly.com/uploads/1/3/5/9/135991747/11ee7e83482d88b.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/4879d6.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/roboka.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/2825e4bf8.pdfIn PDF document text
    • https://faraguwu.weebly.com/uploads/1/3/0/9/130969294/nefabewel_sugadujitorovo_xigisekojedef.pdfIn PDF document text
    • https://tajusubinem.weebly.com/uploads/1/3/4/8/134886452/saxavusavejebixozize.pdfIn PDF document text
    • https://vagonegasix.weebly.com/uploads/1/3/1/4/131482995/7337007.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/7f59efc8-46df-453e-93d0-d564fcf8ee41/what_are_the_different_types_of_narrative_structures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89dc9b95-bcf4-4e91-bfb7-5670697b7f3f/how_to_gain_weight_fast_in_1_week_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1486b46e-800e-47ed-9a74-19ee19b2ac02/sobazavuvikizobevelagufok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba8aa15-1731-41e1-9531-04dcf65207f7/hermes_belt_buying_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92816bd-3645-4e26-904d-4b007e37471c/bupamapepab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a18001-4b08-4fff-9d3c-443c9166a34a/orpheus_and_eurydice_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32244b2e-aebb-4ee7-be63-bb0163cd5391/sobobixorugamamugefe.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 6424 bytes
SHA-256: 120dfd7c7977cfb9a90e0c19aa24ce80f3ad63f69756627d616fe21accc03e95
font_01_sfnt_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 5464 bytes
SHA-256: c7d8297fc4c90f243802e4059dd0a326baba878076c548382e5949c536417364
font_02_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 10760 bytes
SHA-256: 6660880aa2473446cbae16e62f5e2ea349500787adf6ebc5d9b1d010255c0fc7