Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a1d01c4cb301f4…

MALICIOUS

PDF

75.7 KB Created: 2021-02-19 08:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e78fbced564ee75094c77674ceeda69 SHA-1: 906bc86ab6433460d61a54af311ebf75f8f5ad94 SHA-256: 54a1d01c4cb301f4ca08ac9cb13af800fe835cf394ccc2625e0d8acd3495950b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'how to make a womens toga costume', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=how+to+make+a+womens+toga+costume PDF link annotation
    • http://evilcheats.fun/71689973741g7zkb.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/rubumigenit_levat_buxam.pdfIn PDF document text
    • http://detonic-deutschland.website/6702646643qb0gc.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/xijabepinemujo.pdfIn PDF document text
    • http://b4shop.icu/bunosavinatasewaibnl.pdfIn PDF document text
    • https://zuwizogagotajal.weebly.com/uploads/1/3/4/0/134012426/8a689.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/4bcdfa6496fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367303/normal_60036421ad609.pdfIn PDF document text
    • https://kokonasaza.weebly.com/uploads/1/3/1/6/131636703/mutile.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/nunuwovuga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425933/normal_6007f27a90765.pdfIn PDF document text
    • https://miwuzuxatidako.weebly.com/uploads/1/3/0/7/130775980/1f47a18668a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kerizow.epizy.com/duvozexa.pdfIn PDF document text
    • http://dowomux.rf.gd/gofetawibejusaxo.pdfIn PDF document text
    • http://kawojimulogizef.rf.gd/81205792768.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/40449522029.pdfIn PDF document text
    • http://poxizaxo.epizy.com/bokeh_video_overlay_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 5108 bytes
SHA-256: 0df523fdca0aeb428fe4624db2067688593d54bcb742cedcc1d0bd1aef2f1abe
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 10436 bytes
SHA-256: 8f2b1120004a73d8c08f601c751c30c94077cd199b37d27c44c7ba16526f40b3

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