Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fed02918c40e22…

MALICIOUS

PDF

82.8 KB Created: 2021-03-20 08:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cb97a562c03c812e59e3689591995f85 SHA-1: 1a9654a648530ac5d8ad031750cf943f75596e5a SHA-256: a3fed02918c40e22de3c96149025eb8e8d2922060d8aedd6a5c82356a16d3dd8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/wix?keyword=free+daily+oral+language+4th+grade+pdf PDF link annotation
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/rikagira.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/1932752.pdfIn PDF document text
    • https://resivoviwogo.weebly.com/uploads/1/3/3/9/133987135/6261684.pdfIn PDF document text
    • https://libonatelizipo.weebly.com/uploads/1/3/5/3/135326144/3934499.pdfIn PDF document text
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/vutolebovaka-nefupilizola-daxaforo-givizosemeko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_348fb2ec98f746fba18a5c68d772b588.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/fossil_android_wear_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3747d60a-4ad7-4a14-a6ca-1d2d8a228203/how_to_reset_canon_mp287_after_refilling_ink_cartridges.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_5c6650e73fd241aaa2342af1d166e1ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/83077959489.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/sorusejolapuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94019205-51b3-43f1-9164-5ce0c3fc5868/9931656759.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/walojuzavevumoputopizufig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cbf8e4-df73-48e0-a990-317a69e09f7d/what_the_bible_says_about_an_angry_man.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_88afdbbbf47a4e1da8beaa0731d97ef5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/87391156397.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/70206767521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b646306a-5256-4f0b-a5b4-eec0d7f41ea8/58546867887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fcbee9e-66ab-4ec4-bd7d-2861412a5a8d/naming_acids_and_bases_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/try_to_answer_back_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da940f4-8d2d-4327-bf56-77f932b1f28c/1000_places_to_see_before_you_die_wall_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/information_about_cricket_in_marathi_language.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/september_2019_calendar_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5babed49-532a-433f-97f7-6f0daf73dd68/where_can_i_go_on_holiday_abroad_in_august.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/mukuputifizuxamare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f3a485-a964-4ba1-8936-9160711d860a/64021948709.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 5272 bytes
SHA-256: e1daf507448ca8f4c96ab7be236db572f7a3a554d2df0073cb6a7ab4aa21de6f
font_01_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 11404 bytes
SHA-256: e2845256611639dcac00cce0bd6a52d603c83524e03c5b809ddf3c675d2bad15