Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac649e97b5717782…

MALICIOUS

PDF

85.0 KB Created: 2021-04-08 05:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 87e8de015e9cd7416a928457b43022da SHA-1: ec360bb54fdcd661979e438fe7c5cd4b5846b37b SHA-256: ac649e97b5717782a46be8b3dfbc7bcf7a063dcbabeb1e5dfc4c755b13ae5e74
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent link pointing to 'https://nipisod.ru/strik'. This suggests the document's primary purpose is to redirect users to malicious or spam content. ClamAV also detected this as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://nipisod.ru/strik?utm_term=microblading+and+eyelash+training+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415543/normal_6040ab47dd041.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/dHmCFGN/island_beach_state_park_kayak_map.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/RJCgG0p/rotakibisevotazexibopu.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/cBI8Whb/aaa_near_me_real_id.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_60011463c4f6a.pdfIn PDF document text
    • http://jogubewuzamofet.iblogger.org/50021010661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_604348879b9cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_5fcbfd6c4535d.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/uvheuge/police_vs_crime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tabobujimo/20080514228.pdfIn PDF document text
    • http://memavopunon.rf.gd/weekly_tax_table_2017_excel_format.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/68100624660.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/veradobafuvukiwalizi.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/94637652485.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/endeavour_silver_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/kawuredidefovinuman.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/top_5_health_and_safety_risks_in_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/atlantic_slave_trade_test.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_5372a27caaca45fb9fe9a1069cf07384.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/sivonowirudaxowesof.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_9f75d66e53ea428f9f2b9deb7d013d92.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 5388 bytes
SHA-256: 0cad5fcf81c4064adb88dbf5c023386f12dd67fdde11108444113217e238bb1d
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 11160 bytes
SHA-256: 29a0d5853725b9b0d254801a7eea2e3f90d12f712fb63005e5d13808537a490f
font_02_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16168 bytes
SHA-256: 2b9252926f8d78e5f381316bafc8890734f67b61419e86598486e60d8f28cddc
font_03_sfnt_off00013600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333