Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9681141119e477…

MALICIOUS

PDF

81.0 KB Created: 2021-03-29 13:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d30e17405d99088316e5ba959b687e59 SHA-1: 798a60cb8eae756ab0644dbc113eb4868bf0b7ea SHA-256: 3d9681141119e477880198f40dd92a1f1458c1e82c32ca57f0c2eee982b500a4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Mitsubishi air conditioner manual pdf'. The presence of numerous external URIs, many hosted on disposable domains and link farms, strongly suggests this PDF is designed to redirect users to malicious content, likely for phishing or malware distribution.

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://xajibur.ru/award?keyword=mitsubishi+air+conditioner+manual+pdf PDF link annotation
    • http://form-lnstagramcopyrightservice.com/neketigupipajklppd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5ffa54592a776.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/area_and_perimeter_of_compound_shapes_worksheet.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/garuderewototet_woxeva_vupazar.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/shed_plans.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5ff81a6807021.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/73f4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477630/normal_5ffcf0134d982.pdfIn PDF document text
    • https://sozulidalipidin.weebly.com/uploads/1/3/1/4/131437061/5547579.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/bowflex_sport_home_gym_video.pdfIn PDF document text
    • http://organic100.fun/leatherworking_guide_1-_300_classic_wowm87rl.pdfIn PDF document text
    • http://tendernes.ru/56421903121bq49r.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/metro_map_singapore.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/zananupinomam.pdfIn PDF document text
    • http://znakomstva69.space/sat_subject_test_scores_earlyo5bpb.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/dotul.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/situlamadefadilerag.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://bowelabu.rf.gd/26130894215.pdfIn PDF document text
    • http://gudagugagazof.rf.gd/platicas_de_seguridad_industrial_en_el_trabajo.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/the_sparrows_nest_jayton_tx.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/5479243681.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_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 5424 bytes
SHA-256: ee781d972065505a08b4a83eb6df0672a97ad495079432518ec76e227ee316d7
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 10576 bytes
SHA-256: 156b5ee21004ef063f9c6aa651fa772ba1ed5606ffabab5223ab9de330e3da0c
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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