Malicious PDF — malware analysis report

Static analysis result for SHA-256 f861cc5b2e9b1711…

MALICIOUS

PDF

86.2 KB Created: 2021-02-19 10:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e82be5c4603a083839a679b6005e26b5 SHA-1: 768ac5a03390289db3fff39b4188c98da5683f12 SHA-256: f861cc5b2e9b1711d594b14e98ddec9796707cbf680fa814992d764e32fc3293
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, references 'Tintin comic book collection', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=tintin+comic+book+collection PDF link annotation
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/pugarifoguru.pdfIn PDF document text
    • http://gladkoe-telo.xyz/37958716742u5aj6.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/099247.pdfIn PDF document text
    • http://useporte.xyz/2401908656gfvx9.pdfIn PDF document text
    • https://gizafagubezuz.weebly.com/uploads/1/3/5/3/135321184/dusupewubodeberagik.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/gjgc3jb/love_live_all_stars_team_building.pdfIn PDF document text
    • http://coloradocustomelectric.com/amino_communities_and_chats_mod_apk8huo4.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/duxuvuje_lavolulafuvine_nekalijexawu.pdfIn PDF document text
    • http://pububasolemi.22web.org/benshaw_rsi_s4_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/suwenadikum/bLujijU/tower_fortress_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/A7ibphd/super_smash_bros_soccer.pdfIn PDF document text
    • https://cdn.sqhk.co/domonuxasi/iighMjd/pavaxusopikesurabo.pdfIn PDF document text
    • http://tikovg.xyz/fireworks_template_pptzrpx9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jafimelivif.rf.gd/mutegakurokigaluzunoda.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/21495043582.pdfIn PDF document text
    • http://kebafitesulodu.epizy.com/86308071794.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/filleted_accounts_balance_sheet_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/tivafatupaxilesepebuzas.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/duzakelosukafomer.pdfIn PDF document text
    • http://sosirowop.epizy.com/gapokudewibusobos.pdfIn PDF document text
    • http://rusozetowozo.epizy.com/types_of_phobia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 4400 bytes
SHA-256: 6669927a34314abb858e793df82c96e1a2b6df8cc22de4ddd93a795808a4aab1
font_01_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 10836 bytes
SHA-256: 91572c09dc3c8ecf3acf514ff2fa798e8d327814f844fc901e3962cb702df477
font_02_sfnt_off00013d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D08 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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