Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad48668e33d6cf5…

MALICIOUS

PDF

69.6 KB Created: 2021-03-08 05:37:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aea47e9e41fd24e09b89cb6d623ed57 SHA-1: 701e2a0d696973850c01844dfcec0d3aee8febc5 SHA-256: 8ad48668e33d6cf59633b740c118e21f382f72e27bed638dd2c0914ce6513386
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm designed to manipulate search engine results or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=computer+organization+and+architecture+book
    • https://vaferevipesefur.weebly.com/uploads/1/3/0/9/130969420/8ea2ebdc4766a.pdf
    • http://aicberg.net/89129601611kk0o0.pdf
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/1645513.pdf
    • http://setokanekema.mygamesonline.org/asu_mechanical_engineering_major_map_2020.pdf
    • https://lozofatogil.weebly.com/uploads/1/3/0/7/130739213/vowirozemabujubil.pdf
    • http://xojuxelase.medianewsonline.com/pifemulevere.pdf
    • http://basvuruizleme.online/how_to_use_woods_outdoor_timerqqley.pdf
    • http://vozuzutiwajuzip.getenjoyment.net/2363164261.pdf
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/giwigozunekalogamofu.pdf
    • http://getizibibi.22web.org/vocabulary_words_for_4th_graders.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wotodedaruzuk/8189677107.pdf
    • https://s3.amazonaws.com/zidenigad/jodavexolesofojov.pdf
    • https://s3.amazonaws.com/lokijuronig/30270630624.pdf
    • https://s3.amazonaws.com/wizedumi/free_handwriting_sheets.pdf
    • https://s3.amazonaws.com/mozedijiz/72037446492.pdf
    • https://s3.amazonaws.com/fifomi/epsxe_guide_windows_10.pdf
    • http://vosiwajemipawes.epizy.com/13777567574.pdf
    • http://wegigofasaros.rf.gd/nikufufasafi.pdf
    • http://kasarokoxakuke.epizy.com/92312195399.pdf
    • http://nuvitaros.epizy.com/tamil_songs_mass.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d482.bin
78ec78519f9e849686ba2563a6cdf5fbf927975492f14375a84adc86312aee8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 5436 bytes
font_01_sfnt_off0000e6d2.bin
f7cfda831931ff90802681bbf4a1042da23f2bd642902da49f1955960c35d293
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 9920 bytes