Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd44a6c3b125549…

MALICIOUS

PDF

74.1 KB Created: 2021-03-25 03:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84e922a2c242dea9254762eec24aa0e1 SHA-1: ddc2035aa95ee164b1f6fb638242431d52e3b5cc SHA-256: 4dd44a6c3b12554978f68107764aa9940ff62336c9f228798874ec2b401426ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting an attempt to direct users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the heuristics and the detected threat type point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=rug+doctor+mighty+pro+x3+parts+diagram
    • https://mukafakurud.weebly.com/uploads/1/3/4/3/134315218/tupeda.pdf
    • https://nonokutofukidob.weebly.com/uploads/1/3/4/8/134872148/dupusegetev.pdf
    • https://mobejameraxoluv.weebly.com/uploads/1/3/5/3/135316129/bufar_zupopoleve_vavosirul.pdf
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/vadujumisukunu_fulawiwoj.pdf
    • http://dotavulilego.mypressonline.com/the_warren_buffett_way_review.pdf
    • https://zujamapetot.weebly.com/uploads/1/3/1/3/131381682/niwonazupixugijubi.pdf
    • https://dominisu.weebly.com/uploads/1/3/1/3/131379959/kupobaxob.pdf
    • http://tafuxasomup.getenjoyment.net/nujag.pdf
    • http://jerunuju.mypressonline.com/22317979412.pdf
    • http://dokaxirugik.medianewsonline.com/ap_us_history_book.pdf
    • http://jotitojimo.mygamesonline.org/python_data_analysis_free_online_course.pdf
    • https://mixofugu.weebly.com/uploads/1/3/4/3/134351041/tiveloxazexajuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulikowexunepov/vukufedonemujuxo.pdf
    • https://s3.amazonaws.com/babetafaperaxov/rapid_psp_emulator_for_psp_games_apk.pdf
    • http://fuluwaf.rf.gd/gilajexasope.pdf
    • http://sobibuxasegisun.rf.gd/julas.pdf
    • http://ladorum.epizy.com/57708405730.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_off0000e370.bin
27802083adea47f975bd84347b10e1dc4b6ac397e851d4e9d75cad851d2fe4d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 5796 bytes
font_01_sfnt_off0000f71b.bin
a263e8bdb9a1c51bb9751bbba04598cfb4f901a1403ec193ff8828087abf0b96
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 10664 bytes