Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d73ad59edeebed…

MALICIOUS

PDF

69.2 KB Created: 2020-12-16 14:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 54bba6f73147bee62279f06eac860328 SHA-1: 9283616f58cdda3280261d49bfd449034773082f SHA-256: 15d73ad59edeebed739c7fe4737ef347206416b7fb85504cc3668772ae63d08c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that masquerades as educational material ('math worksheets grade 4 pdf'). It contains a significant number of external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM'. This suggests the document's primary purpose is to distribute links, potentially for phishing or malware distribution, rather than providing actual content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafficel.ru/aws?utm_term=math+worksheets+grade+4+pdf PDF link annotation
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/buvodobufapu.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/lexusifexasa_kekujuleje_zakuxovulinobe_vumamemodebuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccaee3b-e045-42ae-8bb2-b3a1c1195a85/lord_of_the_flies_chapter_7_discussion_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f87cbd-f1a5-457d-9e1e-734ddd3abe54/58897483579.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc576008ef7301f8b2fc014/t/5fd60ef9034a586a4f3a21da/1607864058159/fisalewukisexobipiside.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f7fbe9fc3622d5227cd2/t/5fc221959ee0f32b879b58fa/1606558102045/fort_collins_temple_presidency.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4f2fa97599144eede15d/1606373168223/22913290610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e450213-b93c-405d-93b3-bd732e8748ca/vexosumupik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0cb7154-644e-4445-b126-85b0bce9b96a/kikekenezuxovimu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf29459c5bbe674463265f/t/5fd05c8f2f29925fbb4d1141/1607490704132/80190944027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4369bc88-9586-43f3-bd48-c2f6c3215d89/onkyo_tx_sr508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8308ae03-7679-47db-9241-89b180d9b8ba/26247464784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659dd173-6ca8-4504-87dd-8fc86ad3b702/27244413850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86b2750-18db-4b68-ac67-39102c1ad672/61467961409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccff560b-8fcc-4995-9993-7f3c92340749/85175927160.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b3865fa98a681f101f83/t/5fd062c55347e801a81f7622/1607492295198/43702415094.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfa9bd334513fae41f347/1606220443331/barre_town_school_jobs.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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 5520 bytes
SHA-256: 1b4517d3dbfc0bb560f248ded26bbffce0d02beb30647722d7e8184d4f1189fd
font_01_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 10572 bytes
SHA-256: a151fbe294db17c2a368ade788a02c02ed59e065ed7c1391be134daeed9c5560

Open this report in the interactive analyzer, or submit your own file for analysis.