Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16436f2e57dc9e9…

MALICIOUS

PDF

75.4 KB Created: 2021-02-02 19:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cee15594face2b1b5d2add7820d1c8e2 SHA-1: b8c3c669dfa8d4217a53727e77d166e93f2a66c3 SHA-256: a16436f2e57dc9e93e05b9c8d7c2799cd9898e2180075dbbd42999a96e0ffda6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The embedded URLs and the PDF's structure suggest a phishing or scam attempt, directing users to potentially harmful websites hosted on disposable domains. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it might be a generated PDF rather than a typical user-facing document.

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://druttle.ru/123?utm_term=the+mask+of+masculinity+pdf PDF link annotation
    • http://istlan.fun/movie_quotes_search1krco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389352/normal_5fee1d2b29260.pdfIn PDF document text
    • http://ledy66.net/16332890791xpycn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374362/normal_5ffbbf97217c8.pdfIn PDF document text
    • http://graatorama.space/nonanopomumumenqghic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_600a6f92da3af.pdfIn PDF document text
    • http://jopimutedu.iblogger.org/4892201204.pdfIn PDF document text
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/nijanotumesi.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/fb471e894ad9.pdfIn PDF document text
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/95eb3154f371.pdfIn PDF document text
    • https://joripipebepif.weebly.com/uploads/1/3/4/1/134131856/joboteporonewilerumo.pdfIn PDF document text
    • http://pokemonrivals.online/zefefefimekemunohl94z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_6015dae9addb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fenelepor.epizy.com/free_bitcoin_mining_software_android.pdfIn PDF document text
    • http://nedajazamofo.epizy.com/odia_movie_blackmail_all_song_free.pdfIn PDF document text
    • http://leduvusiluvev.rf.gd/49357793430.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 5412 bytes
SHA-256: 5e7c7f191bf793c6cd5672521e53e0a778c950987c0aef094deaac4227c265c6
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_02_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 11476 bytes
SHA-256: 215bb5a70096bad28748a5f10e90d5c44aea84c9e85b673d60eb92136042d307

Open this report in the interactive analyzer, or submit your own file for analysis.