Malicious PDF — malware analysis report

Static analysis result for SHA-256 8765611edef9842f…

MALICIOUS

PDF

70.0 KB Created: 2021-03-23 11:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 7bb52ff5476e0e7579d028a510e3f66a SHA-1: 9c26c68c8c65fffb7dd8493be0e9db4ff1c77f73 SHA-256: 8765611edef9842f5045b4f5f48b146a561f90944a0c0e0dc4b67de489b7fbbe
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or ad fraud. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=synonyms+and+antonyms+worksheet+for+grade+3+pdf PDF link annotation
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/fezoger_galoj_mutuj_nimis.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/is_haruki_murakami_good.pdfIn PDF document text
    • https://roserilufelojow.weebly.com/uploads/1/3/1/8/131856860/xusogipu.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/hbhdgh2/51156596896.pdfIn PDF document text
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/setapusi.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/652470.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/ac2b567e8.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/dJXjTjc/sharpen_the_saw_activities.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/2Pwfihx/average_car_mechanic_salary_us.pdfIn PDF document text
    • https://fopabitibomasad.weebly.com/uploads/1/3/1/8/131857723/4174041.pdfIn PDF document text
    • http://copyright-services-us.com/university_pet_clinic_tucson_arizona8mvwr.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/6YhiijA/30063575670.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/36167868673.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/1643505.pdfIn PDF document text
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/makewofiwasufuvun.pdfIn PDF document text
    • http://neojust.ru/39326572907kp0cw.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/dfigTgj/sepurukuvenopemidadiwoxam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degagaziv/faleki.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/biasi_m96_24sm_c2_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/oxford_dictionary_of_english_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/lobbying_proposal_template.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_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 5948 bytes
SHA-256: 932e7c4c66b5dff8a0a24a06e802ed88f98cec474e9a228216fbbcd4ce219f90
font_01_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 9600 bytes
SHA-256: 65bb0062ea2a986fb3e6e8b3e5e95ad5e93a814a4c00ec1e648e961a5dc21515

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