Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fa56bfd94511cf…

MALICIOUS

PDF

81.4 KB Created: 2021-03-15 16:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a34698667cff640d79e2369fddd9744 SHA-1: 947a09af02d8f4541f881ac3889df05e8b3264fa SHA-256: 90fa56bfd94511cf024aec701a1b5040e4145f7e0e03efa5a9d147513ef113ad
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a malicious domain, identified by both heuristics and a machine learning classifier. The document body, though heavily obfuscated, suggests a lure related to 'a walk in the woods pdf'. The presence of external URIs and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=a+walk+in+the+woods+pdf
    • https://cdn.sqhk.co/viwiratoposu/yjes9jc/fikimagexamopumuvodufimiv.pdf
    • http://mezunirobuf.22web.org/endorsement_letter_for_ojt.pdf
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fe4b0938b90d.pdf
    • https://cdn-cms.f-static.net/uploads/4451206/normal_601267ef6d4aa.pdf
    • http://inmyshtangen.xyz/reaccion_de_combustion_balanceada_del_etanolklngj.pdf
    • http://reggis.info/gloria_copeland_healing_scriptures_youtubey2qyf.pdf
    • http://xojuxelase.medianewsonline.com/what_makes_a_good_newspaper.pdf
    • https://cdn.sqhk.co/mapetidul/gefqlgN/98565517324.pdf
    • http://motorutovibipe.sportsontheweb.net/beethoven_sonata_16_imslp.pdf
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5fcf2dca317d2.pdf
    • http://lightsex.ru/moca_scoring_guidelinespftzc.pdf
    • https://cdn-cms.f-static.net/uploads/4448550/normal_604630e566134.pdf
    • https://cdn-cms.f-static.net/uploads/4451574/normal_604ef0719eb5a.pdf
    • https://static.s123-cdn-static.com/uploads/4370071/normal_5ff7e69d6999d.pdf
    • https://cdn.sqhk.co/maxabamed/gddhbii/computer_love_kraftwerk_sheet_music.pdf
    • http://lamakexo.scienceontheweb.net/19651167637.pdf
    • http://all-gopro.com/resident_evil_6_crack_failed_to_initialize_steamvklfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puwagof.rf.gd/27847192528.pdf
    • http://mumeriladokovot.epizy.com/45362348788.pdf
    • http://ziwunoli.epizy.com/how_to_use_youtube_app_for_beginners.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010080.bin
4114f47dcc72e6b6abe984ae49d9d9b548f1f02b4cdedf20f0c640e2a60a27ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 5176 bytes
font_01_sfnt_off0001122f.bin
ada84fa75318290dccadbc648208d05c7ced82bd3573e82e40e0335f4a16e8de
pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 10904 bytes