Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b728b2dffda34e…

MALICIOUS

PDF

82.2 KB Created: 2021-06-10 18:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7f0c1415ebd8417cbdf8751c83347874 SHA-1: 6c59de3c1e710d55357163847fa9acb7070473bf SHA-256: f1b728b2dffda34e21ed0248f9e165be64afa054af2d9a1a8cd83c9f50f34caa
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 0.9992

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://crysiq.ru/pbw?utm_term=download+tekken+8+ppsspp PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417045/normal_5fe36a3dd5103.pdfIn PDF document text
    • https://xonidaxu.weebly.com/uploads/1/3/4/3/134319292/d54304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_60143b26b8d1f.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/pisif_neromubijevubad_vogeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_606dbfbf1718c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_60446ef31b3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_6014e4099849a.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
    • https://uploads.strikinglycdn.com/files/05e5ab89-cfd0-46f7-9c8c-fd6ae2c61813/64331501015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e324b5-87b5-4da8-aade-73489667c29c/sosoxakegek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb98dff-ad29-470c-ba1c-a251306b1bda/35048158545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c6cbdb-6218-4c7c-a5c4-795155b03235/why_dehumidifier_not_collecting_water.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/bully_anniversary_apk_data_200mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9db00e-a738-4cf4-92cc-ea9f476a1f5d/16877907265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9a910d-a250-4971-8589-c1e62e31e6c3/niginiwalizajoketorixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb141a3-095c-4dac-b456-1a025ee37e1a/what_are_the_5_relationships_of_confucianism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa5e650-ff67-4a8c-b657-d4f47b8b3ac3/miratalukuzivizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53419b6b-1fec-4a34-a030-89b59c488414/wilidorirejagafuvunolapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c00d67-2b84-4250-9d5e-8209ab2f2f04/how_much_is_5_percent_interest_on_50000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439d0536-0c5f-4231-b121-d01525f24e66/how_to_find_hotpoint_dryer_model_number.pdfIn PDF document text
    • http://wotesova.pbworks.com/f/ignou_b.ed_admission_2021_eligibility.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/class_7_english_grammar_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205b6176-b467-4c70-9fea-fabf7f32c137/fewotizinipupefematopevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4fa641-5490-4ef7-a2ba-ac2471531c34/83287088575.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_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 4944 bytes
SHA-256: 74f161fdd6bd2128a43fc235c5fecd325624ff30d16e06092daa8eadabe8293c
font_01_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 11260 bytes
SHA-256: 63b4af29d74cba8d894eb1fbd5ee81a65ad0518a60a6448cd0ed3ab314340e5b
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3