Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbec673ed1fadff…

MALICIOUS

PDF

81.5 KB Created: 2021-03-21 21:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 06e9d93ef81221783559adfbf8a8d458 SHA-1: 74b31391280d10bcd08ed1e5ff7fac2f4d75646c SHA-256: ecbec673ed1fadff240050e2f84062f0d0dfa5a74c9ce95c3862fbd6b80069cb
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, likely intended to redirect users to malicious sites. The document's content, though partially corrupted, suggests a lure related to 'worksheet answers'. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://xezojetit.ru/wix?keyword=organization+of+congress+worksheet+answers PDF link annotation
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/5896388.pdfIn PDF document text
    • https://mokazeke.weebly.com/uploads/1/3/1/3/131384082/05bafa946.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/d21e1a8d8ad.pdfIn PDF document text
    • https://namodezax.weebly.com/uploads/1/3/6/0/136055978/8413798.pdfIn PDF document text
    • http://bestunew.xyz/joviriguzivawuzogenuxetagc10d.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/wonuxavigalem.pdfIn PDF document text
    • https://bimekofag.weebly.com/uploads/1/3/4/5/134596958/dudujepikuxanoxem.pdfIn PDF document text
    • https://pifodepap.weebly.com/uploads/1/3/4/2/134235937/270e9.pdfIn PDF document text
    • http://pavuzebeveju.22web.org/894386681.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/sawun-gazof-wulugosufupok.pdfIn PDF document text
    • https://tidurikax.weebly.com/uploads/1/3/1/8/131856133/gotewivulufev_tukidawokati_linaxav_nemuzusibomenif.pdfIn PDF document text
    • https://risegutu.weebly.com/uploads/1/3/4/2/134265716/vujaxa.pdfIn PDF document text
    • https://jikunuxot.weebly.com/uploads/1/3/4/3/134315974/2682294.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/20c031dc739.pdfIn PDF document text
    • https://murezujal.weebly.com/uploads/1/3/5/3/135305344/3258659.pdfIn PDF document text
    • http://marinarus.space/jogususolozaruzebode3gei7.pdfIn PDF document text
    • http://ditulut.iblogger.org/sagumatijokul.pdfIn PDF document text
    • http://zupuvotan.22web.org/gupuzoxunekuwonanin.pdfIn PDF document text
    • http://carishr.com/orbis_terrarum_ways_of_worldmakingqjhi3.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/29410cbe-e111-4a1b-9d9a-fc67bf6673c1/what_if_god_was_one_of_us_original_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed513b6-6220-4109-8a81-4e33fdc0aaf1/pemezema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9384c88-3539-4afc-9652-8890e50a58a8/komibava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf6e75c-fbd9-4ff0-afe8-ccfc4289fa76/what_is_a_turning_point_in_a_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8516c820-9b16-4b3d-869a-649e86f904a5/army_apft_run_standards_female.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_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 5344 bytes
SHA-256: 20f05e8fd4180894a321525f9cec53e90a0c5f6d83acd62ee999cb8876dd7ab2
font_01_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 10076 bytes
SHA-256: dd32a83bb08f5a1882d1bdc0315fa64e029c7fc053e78c7059232835dffd7ba5