Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e37160c4db3cc8…

MALICIOUS

PDF

90.8 KB Created: 2021-03-22 02:28:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a3d0acf884c39575217dd61ed38be64d SHA-1: 25811551ccb1b016392262e9aeb3fefd60cd706b SHA-256: b4e37160c4db3cc87640dc1e66a9ce1088e80cc7477582a1dea87549f2a8f607
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a 'timer manual', directing users to a network of disposable domains, likely to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/wix?keyword=intermatic+incorporated+wall+timer+manual PDF link annotation
    • http://pagebake.com/offline_video_downloader_free044o2.pdfIn PDF document text
    • http://pumadem.iblogger.org/synonyms_antonyms_homonyms_and_homophones.pdfIn PDF document text
    • http://rukozhop-guide.com/449719380314v6h3.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/3be2c667c78f132.pdfIn PDF document text
    • http://eurostore.info/18411359229zi5i3.pdfIn PDF document text
    • https://rapagifetudi.weebly.com/uploads/1/3/2/6/132682686/7211399.pdfIn PDF document text
    • http://boxberry-24.cc/68667333471lv0bh.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/bomebevajadamituzelidivi.pdfIn PDF document text
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/589a1fc.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/daduvewoso.pdfIn PDF document text
    • http://vengriya.space/wifi_analyzer_apple_storez0bbd.pdfIn PDF document text
    • http://barbanapoli.moscow/raja_hindustani_trke_dublaj_izleg16ty.pdfIn PDF document text
    • http://byt-upak.ru/gcse_english_language_paper_1_sample_answers8ymua.pdfIn PDF document text
    • http://mrshadow.net/dyson_slim_ball_animal_upright_vacuum_accessorieswimh7.pdfIn PDF document text
    • http://tosidegomutif.iblogger.org/jurnal_penelitian_pendidikan_agama_islam.pdfIn PDF document text
    • http://retafap.22web.org/fexuwevepegajizanimigu.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://nonogopikizezed.rf.gd/narabexubakurezafedito.pdfIn PDF document text
    • http://gelilufojoto.rf.gd/jidenimadusenupema.pdfIn PDF document text
    • http://lebusepuwiri.atwebpages.com/51602519526.pdfIn PDF document text
    • http://mukofusakox.rf.gd/repapu.pdfIn PDF document text
    • http://mixezized.myartsonline.com/faringitis_viral_o_bacteriana.pdfIn PDF document text
    • http://divejekojo.epizy.com/jenavomaw.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_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 4952 bytes
SHA-256: 13f99cefe4a858c98646c396af43559288417937de4c5544d66f260d021ed64e
font_01_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 11436 bytes
SHA-256: 17bb8fdb18a16924dd53fff95584f74905fc73d4f8df0fe3790dcdd84f319192
font_02_sfnt_off00014d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D37 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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