Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e18847d1c6559b…

MALICIOUS

PDF

73.8 KB Created: 2021-06-05 23:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8b782f8ca82e300c0c71d9c6d033384 SHA-1: a5c8589bc20b80e547d89df6290ff2b3ab1aa628 SHA-256: c2e18847d1c6559b2f6264e05ba3eddf612f2f307e2db98a67b242005aad0c05
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to seemingly benign PDF documents hosted on platforms like Strikingly and Weebly. However, one critical heuristic identified a PDF link farm, suggesting a malicious intent to manipulate search engine results or direct users to specific content. The primary malicious URL identified is allytemp.ru, which is likely part of this link farm. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/pbw?utm_term=how+do+i+tell+what+year+my+evinrude+outboard+is
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/danigenapivukoj_wenutagoxem_xagavatezanov_jupigugetoxugiv.pdf
    • https://kamefumude.weebly.com/uploads/1/3/4/0/134018396/e728347.pdf
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/7a4058fcf0c300f.pdf
    • https://gemirolav.weebly.com/uploads/1/3/1/6/131606407/3132628.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vejivab.pbworks.com/w/file/fetch/144567987/what_is_in_mod_cauliflower_crust.pdf
    • https://uploads.strikinglycdn.com/files/178ccd52-e0b1-4245-a17e-491d5835dc06/palabras_agudas_graves_llanas_esdrujulas_y_sobreesdrujulas.pdf
    • https://uploads.strikinglycdn.com/files/35d173b9-c67e-48fb-a72d-1a3ad3833dcc/why_is_18th_century_called_the_age_of_prose_and_reason.pdf
    • https://uploads.strikinglycdn.com/files/93c60437-9420-43eb-9347-7e1c04e049b3/jofoluvemurinubujozewug.pdf
    • https://uploads.strikinglycdn.com/files/0898a91e-1d67-4769-95ef-afb2de8f2126/maxi_cosi_pria_70_car_seat_travel_bag.pdf
    • https://uploads.strikinglycdn.com/files/0452ffed-66a0-4ca0-a597-00f9adc609fe/80551942747.pdf
    • http://tereburokofe.pbworks.com/w/file/fetch/144504690/vabafumetoropeperakuvam.pdf
    • https://uploads.strikinglycdn.com/files/6d085bef-fdae-4a77-b9fb-e745f30841e0/mezuzakalog.pdf
    • https://uploads.strikinglycdn.com/files/ec6dd452-90b2-4a54-bad6-fd0d681539fb/donadirinigupoxudokud.pdf
    • https://uploads.strikinglycdn.com/files/6258ae23-968f-4aa0-922c-dd81170d90ec/descargar_disco_de_julion_alvarez_2019.pdf
    • https://uploads.strikinglycdn.com/files/88d33a01-0261-4c4f-8cb2-0f86a283bd34/48506160919.pdf
    • https://uploads.strikinglycdn.com/files/cb0d1a6d-b293-48c8-8f95-e386a3586a36/lelijikunipexowuwatab.pdf
    • http://jujirafamena.pbworks.com/f/jizimiwur.pdf
    • https://uploads.strikinglycdn.com/files/2a682180-e827-4c66-9de0-4e322093aa58/wamosaxaparawirunega.pdf
    • https://uploads.strikinglycdn.com/files/47608187-e48f-460f-8a44-d9aae5df2a99/47877989860.pdf
    • https://uploads.strikinglycdn.com/files/987a8a80-f562-42c5-a066-64e98d8abc8b/survival_of_the_fittest_examples.pdf
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144504939/ribofis.pdf
    • https://uploads.strikinglycdn.com/files/03efdbf3-b7bd-4bdb-99d3-2fc79adbc090/60779036215.pdf
    • https://uploads.strikinglycdn.com/files/3a0749d6-5277-4ba4-8ab6-232d745b4ac4/76399416146.pdf
    • https://uploads.strikinglycdn.com/files/8bb0b99f-0ded-4143-a929-1b5c95926dec/muvowonovavaviko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d671.bin
e0ae4dc7e7ed821cc909ee78e3cd9e2fce517c733cd6e9baa3ecde5be5d0e84a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 5304 bytes
font_01_sfnt_off0000e85c.bin
c01328e5ed114df7ba00b0f2e91585326a390f8eb7f45516ab6033c3f10e367d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 10152 bytes
font_02_sfnt_off00010b37.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 4324 bytes