Malicious PDF — malware analysis report

Static analysis result for SHA-256 71195aa30433e4ca…

MALICIOUS

PDF

76.0 KB Created: 2021-03-02 14:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59f6aa3935bdf2ed7f67c9a638af50cc SHA-1: 99f88a3a99a7fa30d32a95a1a5e6dd63ed7f7f56 SHA-256: 71195aa30433e4ca69ed33edf894a44f98a0bf9220f8d81a82439b747a176e91
126 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URLs, many pointing to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/aws?utm_term=how+long+cook+chicken+on+george+foreman+grill PDF link annotation
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/5870931.pdfIn PDF document text
    • https://suwisabinupa.weebly.com/uploads/1/3/5/3/135351097/670958bb7a1e9b.pdfIn PDF document text
    • http://tujozavido.66ghz.com/knot_guide_printable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427105/normal_5fccda4247376.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/7661373506.pdfIn PDF document text
    • https://solatozelejas.weebly.com/uploads/1/3/4/7/134714892/b599f2b2.pdfIn PDF document text
    • http://nebibila.iblogger.org/applied_algebra_and_functional_analysis.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/wazorixekunafob/34704917177.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/79442932922.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/big_time_rush_paralyzed_song.pdfIn PDF document text
    • http://savefativiluz.epizy.com/verojo.pdfIn PDF document text
    • http://puwawetodu.rf.gd/jukexomexesebejefedep.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/best_quiplash_answers_list.pdfIn PDF document text
    • http://zujexig.epizy.com/40663590467.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_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 5236 bytes
SHA-256: 5aa6da90f83f41f8ae10a6ea87fc81e43b509498c88ec405c7814b34345f0b6b
font_02_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 11320 bytes
SHA-256: b7f743e5fb26c19ee45eaa6df80bebde2e0271ecc39fb7dd09a74df04b51e99b

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