Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c3d1ebbcec0596…

MALICIOUS

PDF

122.9 KB Created: 2021-04-05 05:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17c77332d6ba798f3e2ff57470533221 SHA-1: c0843e5e518d727fff0a9f5d7bbe8727de113367 SHA-256: 26c3d1ebbcec05960ca4686c3fd0a40badf2ea81c8631858a9eda986f1a46db0
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 0.9995

Heuristics 6

  • 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 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://ponafet.ru/award?keyword=the+berenstain+bears+books+pdf PDF link annotation
    • https://bidoruwo.weebly.com/uploads/1/3/4/6/134651737/kadupiremomo_rugolem_letape_tefikoz.pdfIn PDF document text
    • http://peuly.xyz/77131430942r7gr9.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/bjcjgUV/kuxevekofavimuguvewib.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/dcKjghd/entergy_texas_pay_my_bill.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/kazakilen/jhcCTdC/wikojumajokosazoxugowagav.pdfIn PDF document text
    • http://lamovingcompany.com/28961755229y6lqh.pdfIn PDF document text
    • http://airet.space/fijevezebiqzy9f.pdfIn PDF document text
    • http://thrivewebs.com/realidades_1_practice_workbook_answer_key_3aruqtl.pdfIn PDF document text
    • https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/789d449717.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/romiruzesar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/vemuzamamewasidagidi.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/diana_ap_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9043bd50-8caa-4f42-860b-f42b5c4db38a/the_man_in_the_high_castle_season_2_episode_9_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/nanutudanofovisi.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/jusabud.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/subject_pronouns_and_ser_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a9774db-71e6-4958-b1a4-357f8736105a/24457836515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf716ed6-b1fc-4b90-b7a0-ee85a0737edb/mathematical_rules_for_negative_and_positive_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83d6bca-2927-4435-89e0-c780819070bb/93161783316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0823e95-058a-4de7-87ff-8964806b0213/is_hp_stream_11_a_good_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9427dc5e-73b4-47f2-849f-1d1e9cbce626/relasunokibef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df41bc7d-665e-4f6e-bef2-93436a6ad2f8/how_much_does_family_dollar_pay_an_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e1c366-ad8e-4c58-bd82-de38eedab071/senco_nail_gun_manual.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_off0001a352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A352 5248 bytes
SHA-256: 1c01dac70b3efd3eb947ac6d063e292f31f7f4bd5d29b8719ce663f2000acaa4
font_01_sfnt_off0001b517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B517 11488 bytes
SHA-256: 85e67bef2294267c5aae6db17e330cb35e39bd31e6b51d9dca44a6ec5151a705