Malicious PDF — malware analysis report

Static analysis result for SHA-256 8722fb06fd24f528…

MALICIOUS

PDF

185.5 KB Created: 2021-01-26 09:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9ba7afea68976193b122ca7ac2c41297 SHA-1: 2d26e141288b70db515452ec38a52bebed09169c SHA-256: 8722fb06fd24f528044b99778b0fe16f482abe8fa7db406d7161d43886b37d43
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'lectii de sex tantric pdf' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9731

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://trafffi.ru/123?utm_term=lectii+de+sex+tantric+pdf PDF link annotation
    • http://supfitket.buzz/kajotuwaget6oxcs.pdfIn PDF document text
    • http://runolive.com/25487760292yp3l0.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/sifutosagida.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/ighjW0G/96551564624.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ZgctBXh/63490020418.pdfIn PDF document text
    • http://jufidozotazi.66ghz.com/c._a._t._s_apk_mod_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/jdzMFhb/shipwreck_island_miniature_golf_myrtle_beach.pdfIn PDF document text
    • http://freds.space/solar_2120_wire_feed_welder_for_saleinj0g.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/2546990.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/vy4BLjf/nabonasekafo.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/hxhhDgj/spinal_tap_cast_then_and_now.pdfIn PDF document text
    • https://jomezafivawig.weebly.com/uploads/1/3/1/8/131856232/kowaru.pdfIn PDF document text
    • http://thefortykuti.com/2772655511194tyb.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/91055.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/NghP61Q/matrix_live_wallpaper_for_pc_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://pavinudoj.epizy.com/vobotuwiwoguladatiwawun.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C88 3304 bytes
SHA-256: e46920e4ff817861e65a8c51e9258ebb9296a0ab83109d9f2aef8ba862b1ca41
font_01_sfnt_off00025868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25868 5128 bytes
SHA-256: dffb99025878815547a67f3b070506db0516c1b5bdbf3bf5f7098e42b2356219
font_02_sfnt_off000269f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x269F2 3772 bytes
SHA-256: b9b49a3c453c53986d7a61d4291ac5a87065d82ff96be43ef0dca6427e6dc540
font_03_sfnt_off00027596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27596 16264 bytes
SHA-256: 70adabffef8663f8854fa6faaf9127b2e6d8db19390ad70fc888244a5386bc68
font_04_sfnt_off0002a497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A497 16220 bytes
SHA-256: 0588e05a8d2e83888b6f196c82371469cc143453fb326e4023370ca5a3152106
font_05_sfnt_off0002ba30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA30 8520 bytes
SHA-256: d97923392b31b5373d83cfe2fbe95654c4442763a5ba2377b17f6a1e15a65503