Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffc385daa2c5934…

MALICIOUS

PDF

75.9 KB Created: 2021-02-11 19:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00523e6263177621ef4b3e1766bc103c SHA-1: d51832f6f9f6afbea1c67c54e8220fcdb0db852e SHA-256: 8ffc385daa2c5934a7bf1dcaf6e6b08d1951afd2c01cc808f89d12802aef985c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF's structure, which appears to be generated by wkhtmltopdf, further support its use as a lure to external malicious sites.

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://baarspo.ru/wix?keyword=guided+reading+activity+13-2+eastern+europe+answers PDF link annotation
    • http://bamasadukarudam.iblogger.org/85677619235.pdfIn PDF document text
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/5340578.pdfIn PDF document text
    • http://laguduzimunek.22web.org/81976728005.pdfIn PDF document text
    • https://dupukaradox.weebly.com/uploads/1/3/6/0/136015529/datuxinozizadikeja.pdfIn PDF document text
    • https://benanuvez.weebly.com/uploads/1/3/0/8/130813453/latuduwevefakimipoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/can_t_hold_us_instrumental.pdfIn PDF document text
    • http://volemefejosi.rf.gd/marriage_invitation_templates_for_friends.pdfIn PDF document text
    • http://favigagiwu.epizy.com/vewinabijejanafep.pdfIn PDF document text
    • http://dovamarun.epizy.com/aradhana_old_telugu_movie_songs_free.pdfIn PDF document text
    • http://xewenofos.epizy.com/prefix_suffix_worksheet_for_grade_6.pdfIn PDF document text
    • http://judejelalub.rf.gd/greensleeves_guitar_sheet_music.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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5876 bytes
SHA-256: 02592a205fb79fae7b8febc736d5a2087a492f1b1ec0a58949d611961ca78ade
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 10732 bytes
SHA-256: 06db0ed6b5fdd8d664ffe565c68adfe3a723468e85d88055a96c9dda5a044750

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