Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdb9b5e7e5f3257…

MALICIOUS

PDF

106.0 KB Created: 2021-02-20 07:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e548bc7c5a8d9b135e3e8575ec746c2 SHA-1: 395fd2bdd747e93af79d291c789c4c9fbdd19e3d SHA-256: bbdb9b5e7e5f3257b6ed27439da054fddb49a1a4e56b542daf63d3cd6f90b0c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/wix?keyword=female+kobold+x+male+reader PDF link annotation
    • https://cdn.sqhk.co/kefekawit/6qsgdd7/jigatodesuworax.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/6gcjjif/mopixuferiporupujis.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/hjhjfgh/gmail_login_history.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/gegchhS/fidget_spinner_product_life_cycle.pdfIn PDF document text
    • http://wavepolabipal.22web.org/medical_report_online_uae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366399/normal_5fc7970e18688.pdfIn PDF document text
    • https://cdn.sqhk.co/gemesikexo/ahe5UqE/transparent_tv_screen_cost.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5ff115d00d3ac.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/f04jh0z/zugizizowuj.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/aghPwge/jofup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_6017532308fab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafudezukixoz.epizy.com/buddynice_2019_album.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/johnson_s_dictionary_reading_answers.pdfIn PDF document text
    • http://mupufuten.epizy.com/test_av_android_telefoner_2017.pdfIn PDF document text
    • http://fuginifetulad.epizy.com/13215874459.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_off0001673a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1673A 5020 bytes
SHA-256: bee81a0aef97f59a78a8d05e6203fe9eed2ea3d9ae99cccf1dd7384291de7215
font_01_sfnt_off0001783b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1783B 10184 bytes
SHA-256: 4ce61c419722dc72d2bdcc86a43308915f4857bea5051e12c99ecf415f35bff6

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