Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd56f8f9bf95e50…

MALICIOUS

PDF

87.8 KB Created: 2021-02-10 02:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 95cda19c26c25e4a04656380142de684 SHA-1: 388ee50935fad14d9b45ebf49696de1d706819e8 SHA-256: acd56f8f9bf95e502d2c91cb36c6a7e912f031e9e9afa01f92ad56ec69040a7b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for directing users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jacksth.ru/aws?utm_term=druid+pathfinder+2e+guide PDF link annotation
    • http://wekeb.space/49510281363s5ky8.pdfIn PDF document text
    • http://scrlt.xyz/korean_english_dictionary_free_download7aogp.pdfIn PDF document text
    • https://bexaxaxaf.weebly.com/uploads/1/3/2/6/132682125/jakobiliw.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/6953716.pdfIn PDF document text
    • http://mon-cmbretagne.com/53985697634dbu1i.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/fobabar.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/gjFo0gh/49923148652.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/wegizopu.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/jargjjb/deeeep._io_beta_animals.pdfIn PDF document text
    • https://zazafiwizodizi.weebly.com/uploads/1/3/4/0/134041258/10914ebb366.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/7037891.pdfIn PDF document text
    • http://znalomstvavip.site/how_to_use_fine_chromatic_tunerw1gjn.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/rufonali/bleacher_report_raw_grades_results.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/telugu_old_is_gold_audio_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/tajima_embroidery_machine_software_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 4996 bytes
SHA-256: 573c13bfd02d808f346ea89ae757bb4f38ffe85321eebe7c44d20b7608541a79
font_01_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 11084 bytes
SHA-256: 4c67ca75dc4b9ada2fcc81aedde3596fd3739f7aee50ab2588801a522f574c1a
font_02_sfnt_off000143de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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