Malicious PDF — malware analysis report

Static analysis result for SHA-256 f992ec19cb978f5a…

MALICIOUS

PDF

94.3 KB Created: 2021-04-02 23:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4fb41f6cbd40c8e563c94412a5c69726 SHA-1: b37928c80027e4673ad841297fa216e0b0780b20 SHA-256: f992ec19cb978f5a031e106424ae9cf16981970329d28abf415e73feb68b06f7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gimoguvi.ru/award?keyword=biometria+hematica+en+pediatria+pdf PDF link annotation
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/zomofufofonaxugow.pdfIn PDF document text
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/92826b8.pdfIn PDF document text
    • https://lovemaxo.weebly.com/uploads/1/3/3/9/133997317/pejutiwik.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/nebim.pdfIn PDF document text
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/wokobosurizape_mapiwa_letosuguvoraka_xojagedi.pdfIn PDF document text
    • http://leledup.mypressonline.com/kenwood_ddx470_wiring_manual.pdfIn PDF document text
    • https://xujokutiw.weebly.com/uploads/1/3/4/7/134749543/toxugovakof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_601de84bc4bd5.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/7391642.pdfIn PDF document text
    • https://rezalebivug.weebly.com/uploads/1/3/0/9/130969918/kutunavej_kusagufer_nazenovikolone_kolubusele.pdfIn PDF document text
    • http://gixapovunugu.getenjoyment.net/51996653563.pdfIn PDF document text
    • https://kefagifugujog.weebly.com/uploads/1/3/0/8/130813645/85e4ed37abe2701.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/narifop.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/mofamoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5ff0f17817e2b.pdfIn PDF document text
    • https://tuwijojax.weebly.com/uploads/1/3/4/4/134477229/jobumufur_niluzij_sebodoz_ligetiwo.pdfIn PDF document text
    • https://jedumetunu.weebly.com/uploads/1/3/5/3/135388943/milokawuvavakup.pdfIn PDF document text
    • https://nusupubibirimu.weebly.com/uploads/1/3/1/8/131871553/rubarulanad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/biomerieux_bact_alert_3d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0e6cfd-0103-4791-8162-a381d3fda889/how_much_does_business_development_manager_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6658ada-70e6-4640-bca3-71961c18031f/ruckus_prices_in_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ce1e00-f42a-4eb2-a57a-af2e20cc71c8/xoverip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3b8816-8407-4b14-a32e-2c6e8b9cda02/59617336397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b778a93-6561-4604-b264-c0e975e7b341/xifemavaso.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 5224 bytes
SHA-256: f12975f3443dd214b817854777ae3c4787691a5d76d7fa631c37f2e86ba7ec56
font_01_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 5236 bytes
SHA-256: 16dcbc0fa226ea2896bf8b7ee327ce5b3c4106dda5f9afa0fea97e44f61516e3
font_02_sfnt_off00012dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAC 11780 bytes
SHA-256: 28762eff5cd0923cdc6aff4f836eb7fd31adf8feb921caf70499992c4ee55e6a
font_03_sfnt_off0001542f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542F 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449