Malicious PDF — malware analysis report

Static analysis result for SHA-256 27665cf5d18faa8e…

MALICIOUS

PDF

114.9 KB Created: 2021-02-06 03:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dd85df0954d0b337a15ccf7edc4de04b SHA-1: 82e622cf2d89a5a08aa807e48e8aaa9be8626655 SHA-256: 27665cf5d18faa8e9ef65b7df4aae12f01d2ed3cabb7ea4fe6edecee5f9ea437
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('crophysi.ru') that is likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a physics-related topic, which is a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=luz+reflexion+refraccion+y+difraccion PDF link annotation
    • http://vuzopozakobepe.22web.org/guarantco_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/EZhaBhe/wonoxuzuteweru.pdfIn PDF document text
    • http://fasusugexewi.22web.org/63138839916.pdfIn PDF document text
    • http://bnl-jobs.com/88218676826tb43u.pdfIn PDF document text
    • http://pr-bux.online/fundamentals_of_management_10th_edition_robbinsoha8v.pdfIn PDF document text
    • http://reduslim-shop.site/foxirewufidejizoxesey8e50.pdfIn PDF document text
    • http://wofeboz.66ghz.com/simple_english_story_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473971/normal_5ff6774f4516f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_601ac0f38a9fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5fe2ca415cbf9.pdfIn PDF document text
    • http://titoto.xyz/proses_fermentasi_alkoholzhtq7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5fff16138547d.pdfIn PDF document text
    • http://boviriso.22web.org/big_hero_6_2014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5ff4548f2b4b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lunofalogejutu.epizy.com/45675330194.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/commuter_benefits_program_employer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/template_powerpoint_pptx.pdfIn PDF document text
    • http://kudikixaxalen.epizy.com/73040912998.pdfIn PDF document text
    • http://damoserik.epizy.com/vax_ccmbpcv1p1_user_guide.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_off00015edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDB 4996 bytes
SHA-256: 071bdf638b9e372ef09a93024d6becafb0f0f74b4d1783e7c5d3918227ad6246
font_01_sfnt_off00017000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17000 16124 bytes
SHA-256: 59cdfadf3520bbe9081761fc9651c21ac1d10475425bc6cc6629fc5a74431acd
font_02_sfnt_off0001a599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A599 16428 bytes
SHA-256: c9e48378b4ccc47627ab468be9f0ef7f328c2233fadc739c27f2b659339788f0

Open this report in the interactive analyzer, or submit your own file for analysis.