Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bff28673b82f2ea…

MALICIOUS

PDF

84.8 KB Created: 2021-03-22 03:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dd1774f5f0bda38290d0620317c2ca6a SHA-1: 71825cccee5156b263e7f14f73f9c94c976b57c0 SHA-256: 2bff28673b82f2eaa776c6a56e1c6ad5591adf613baacb417dd037824776384a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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 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/wix?keyword=cursive+alphabet+banner PDF link annotation
    • https://zoninezazazi.weebly.com/uploads/1/3/1/0/131070362/zikowod.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/L3hemhh/2713775751.pdfIn PDF document text
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/658823.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/kojibirozu.pdfIn PDF document text
    • http://werewov.22web.org/amyloid_peptide_formation.pdfIn PDF document text
    • http://nuzabokazovuwa.iblogger.org/27627073495.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/hagjgxn/zomopawibuzabadugixo.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/foKQ2Jq/20341869933.pdfIn PDF document text
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/budunig.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/juYKygj/4806506601.pdfIn PDF document text
    • https://bilobusi.weebly.com/uploads/1/3/4/8/134872308/4324880.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuzuvulas.epizy.com/heterogeneous_catalytic_hydrogenation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab80397d-ecf3-48b8-8f3c-a3af10092630/ryobi_table_saw_bt3000_miter_slot.pdfIn PDF document text
    • http://rigeladujonij.epizy.com/bostan_saadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9076bc-4e8e-4822-9ba0-5e8fed0505f2/washington_state_unemployment_standby_extension.pdfIn PDF document text
    • http://manimakokubeg.epizy.com/how_to_set_timex_alarm_clock_it2312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190fe195-7fad-45f8-b681-5fb9025e09de/what_disease_did_stephen_hawking_have.pdfIn PDF document text
    • http://mutojux.epizy.com/tudisozif.pdfIn PDF document text
    • http://jejivosijej.rf.gd/bittorrent_espaol_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7f48b0-9498-40de-93e7-ca76b4f456b7/what_does_the_catholic_church_use_for_incense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f8500b-b8b4-4ff0-baaf-2f4a6b0aa476/ramaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/792c2895-e0c2-4cf2-a704-cbb513ea8968/71573441260.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 5012 bytes
SHA-256: 049bcc0b520b8cb1784f870e23e92046177fd313f8587e1b8ec2687763af186b
font_02_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 12392 bytes
SHA-256: 21100de79b0405e5006e16ec755003854e12f97ff96651bb26a9ae26b928ff39
font_03_sfnt_off00013071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 16096 bytes
SHA-256: 4b9de346c611a76f94bc6ed009431785aba47e2e3321a5840ca0c7319a691060