Malicious PDF — malware analysis report

Static analysis result for SHA-256 922ff654bc9aacd2…

MALICIOUS

PDF

85.9 KB Created: 2020-12-26 16:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3c33adcbe57e4e987d44be50f09562f7 SHA-1: eb710dddc50df94c774894640aa8fcc26fe43d76 SHA-256: 922ff654bc9aacd2d3880a97756a54e43174821d092583fd04cddfeb289b429f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The presence of a URL with 'utm_term=nios+deled+exam+date+sheet+2018' indicates a lure to attract users searching for specific information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://trafffi.ru/aws?utm_term=nios+deled+exam+date+sheet+2018 PDF link annotation
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/c3178b67a4e9.pdfIn PDF document text
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/sutuje-gimupaze.pdfIn PDF document text
    • https://cdn.sqhk.co/fetadupozo/Phdg6ic/hockey_scoreboard_ceiling_light_fixture.pdfIn PDF document text
    • https://watuwejaxor.weebly.com/uploads/1/3/4/4/134437052/4768969.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/MjeFCnd/zombie_survival_kit_ideas.pdfIn PDF document text
    • https://ronizizuvuf.weebly.com/uploads/1/3/4/7/134707383/zurajafebofosid_jekozatipezo_zikavijowefiw_biwalipupip.pdfIn PDF document text
    • https://disamaro.weebly.com/uploads/1/3/4/6/134697064/gibaroxevatu.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/gejcgjX/virtual_classroom_background_free.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/durikep-bifoxigupu-vadesib-biwufilo.pdfIn PDF document text
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/zowabazodanukisureje.pdfIn PDF document text
    • https://wowomake.weebly.com/uploads/1/3/4/6/134679477/labug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/7444d48d-6efd-44d0-95b0-519cd53ee2f6/air_hammer_nail_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc34fda-0868-47eb-a697-52a92c06504f/xemalegilodedexokev.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 5524 bytes
SHA-256: 99f217ddccf0335a4048d99122b3e2e144287c2f4534c0aad4a52f4db87fe16f
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 9828 bytes
SHA-256: 819272897ac0d8b2df5b8d26f2f04d6dcfd1711bfe11f1f436a1ac4264e633b7
font_03_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 10620 bytes
SHA-256: 5cb89a4a670cc7b003d34acbdb0e333f9a5bf9263995f3b98ec6b6614cd77117

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