Malicious PDF — malware analysis report

Static analysis result for SHA-256 0400b8d342e706be…

MALICIOUS

PDF

110.3 KB Created: 2021-04-01 23:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b281ff9179baaf929db32c9054769be1 SHA-1: e322bec1f4d40441e9e3481e8ec85fec13dc4fa0 SHA-256: 0400b8d342e706be1e7e95561e5d88a34580b16c91aa9cecebb2b15e677eefe9
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=l+abaissement+cryoscopique+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_6018606be3124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461202/normal_5ff34b500a325.pdfIn PDF document text
    • https://cdn.sqhk.co/kimorotadopo/gj6ugi7/motogp_calendar_2019.pdfIn PDF document text
    • http://hrushch.space/sierra_load_data_308_155_tmkyerv2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_60517e7f67749.pdfIn PDF document text
    • http://ru-order-687646765445.art/maytag_bravos_xl_dryer_door_reversal_instructionswp792.pdfIn PDF document text
    • http://arevakar-travel.com/how_to_reset_a_casiovi1rw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_601cce7677457.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/idR9iig/shoot_em_up_bone_thugs_n_harmony_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/afzgiUL/video_status_maker_apk_download_mv_master.pdfIn PDF document text
    • https://cdn.sqhk.co/fagesupuwe/ggijejb/dessert_recipes_using_filo_pastry_sheets.pdfIn PDF document text
    • http://trells.space/online_advertising_definitiontik4p.pdfIn PDF document text
    • http://setofexperience.site/screen_mirroring_apk_for_tvkiejj.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/XFY50hd/19374865915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67efdb7-a4da-4204-98b6-24dc9e9807b7/wards_signature_sewing_machine_uht_j276d.pdfIn PDF document text
    • http://rifovedukuj.epizy.com/70680295290.pdfIn PDF document text
    • http://bavusefo.rf.gd/26870024672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ae8123-8cba-4d37-89a7-1b8d9493ad0b/77563449393.pdfIn PDF document text
    • http://dagilupakov.rf.gd/29727092653.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018c7c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18C7C 18312 bytes
SHA-256: eda64130d5a793810ec17aefb944b8328ac9e2f6f399ff124330f0469e439edf
font_00_sfnt_off000148df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DF 5576 bytes
SHA-256: a7afccea897d34bb565f459a0857ed815d4c8f55b566a12ca366b1e3f4bbafcc
font_01_sfnt_off00015bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBF 15448 bytes
SHA-256: 410c0c9ee20cda6bd053be96f5f90e8cacda03b83ed9428885d821dd177a6121

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