Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c55089b097250a0…

MALICIOUS

PDF

66.5 KB Created: 2021-04-06 03:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f37f26771c34c6d2ee258771a38893bb SHA-1: 5b28421419f037f524690195039e798a097b0baa SHA-256: 3c55089b097250a0703334cae6ad6ace062578065c7edd35e2f17873f86937f7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://gimoguvi.ru/wix?keyword=tripp+research+10+round+mags PDF link annotation
    • http://kivudutamazawan.22web.org/teputasikofumuxetudaki.pdfIn PDF document text
    • https://fatagijow.weebly.com/uploads/1/3/5/3/135314750/tugepegura.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/djhSicl/red_formal_gown_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegejivo/aiegiCN/wigasuv.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/3770080.pdfIn PDF document text
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/9b9cbd0a5.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/nghgiV8/34398364669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dirosulazab.rf.gd/administracion_hotelera_division_cuartos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07447094-c675-44c5-8c2a-26c131bae28c/87069061577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587d04c3-2f39-4f33-8e63-8c57b0e82202/wordpress_themes_free_blog_travel.pdfIn PDF document text
    • http://ruvibume.rf.gd/stihl_fs_56_rc_pull_cord_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9772b9-53ca-4a05-b3c1-c7165cbdef20/how_to_change_my_voicemail_on_my_lg_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7e15c4-d7a9-43e8-95eb-8d641f8b98c6/42092126740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341d2442-cd54-4765-9111-212763dafef6/23059491464.pdfIn PDF document text
    • http://tarebepanadobep.rf.gd/bekorono.pdfIn PDF document text
    • http://peworesafasar.epizy.com/catalogue_toto_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef91a24-9281-44bf-ba6a-0e3ea322740e/the_sun_in_the_morning_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c75e31-9634-4a91-b97f-4b3289adc21b/what_were_the_wars_of_greece.pdfIn PDF document text
    • http://goniwenu.rf.gd/getting_the_love_you_want.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda58e79-923d-4abc-935c-deb745dd9281/jezujebopugumiwamawelobib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6343d2fe-d568-48cb-949b-7e3c896bfad1/51422567811.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_off0000c751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 5596 bytes
SHA-256: a97419dab609a94843f644adf05d209fd4afa0445c594fc981a3c7ff99fd3f7c
font_01_sfnt_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 10092 bytes
SHA-256: b1bb5289d2a1884e7d7e047fd787adce1bae87c0cb1c2bc788e59210a101968f

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