Malicious PDF — malware analysis report

Static analysis result for SHA-256 45975dfaf894b4a6…

MALICIOUS

PDF

83.7 KB Created: 2021-06-01 02:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01f5592ad4b78982ff35467b15795568 SHA-1: 9b1e01644de005c7501c2ba28b25e9116831aaf1 SHA-256: 45975dfaf894b4a6e64730403da517496e8acd7aca2bd57f4eff28fcd567c299
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to redirect users to malicious content.

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://huntic.ru/pbw?utm_term=que+significa+cuando+sue%25C3%25B1as+que+tu+pareja+te+fue+infiel PDF link annotation
    • https://regujume.weebly.com/uploads/1/3/4/3/134339948/577990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_60329854d911f.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/nofapukezawatod.pdfIn PDF document text
    • https://sipitajopidegol.weebly.com/uploads/1/3/1/4/131453448/naxagemeruwusiwaraku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427528/normal_5fc763c6b53a0.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/7739894.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/badokokomugekot_toronoxijeba_kujev_rolud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fdda4733c08c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_6047f5bd1bdf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404512/normal_600f42ce33d00.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/2e87dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_60663653c2a74.pdfIn PDF document text
    • https://gakexuguzadeza.weebly.com/uploads/1/3/4/4/134401700/6957895.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/0e5b1e50541bc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://marutipug.pbworks.com/w/file/fetch/144429018/93174716620.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/tekken_blood_vengeance_2011_bluray_1080p_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144d4bd7-8eb1-4afc-a31b-7fb9fe189a84/the_merchant_of_venice_questions_and_answers.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/pros_and_cons_of_tax_relief.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/notice_technique_frisquet_gazliner_23_kw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01acaf9d-ccbf-4f00-b727-c216abb3b2f2/best_nds_emulator_for_android_2021.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/60532247026.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 5800 bytes
SHA-256: 78a88c6143addef7583ee82f1d9f71809fcf5974500d409e0ddcc1fd60e7efbe
font_01_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 11700 bytes
SHA-256: f174aa0a5c95bb5a7fdcc2842f1f72bdd3be43951714ebc4d6c12da996cde999
font_02_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449