Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c1da0928f51f00…

MALICIOUS

PDF

78.4 KB Created: 2021-03-15 06:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7add5c123fa4fa0a8f5ab22be502e89d SHA-1: da18f24a521c0d6e76e1a48bb18d662d19ddbd9c SHA-256: 87c1da0928f51f000966eeafdb9478a213601b34c3f2fd023592f20dd8a68423
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://botokaw.ru/123?utm_term=blaque+im+good PDF link annotation
    • https://gitutibilaralib.weebly.com/uploads/1/3/1/3/131384503/lowetoneloj.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/ghGXhah/entry_level_economics_jobs_los_angeles.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/rajijoxiwajozameroxep.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/aihG8AJ/naruto_x_boruto_ninja_voltage_tier_list_2019.pdfIn PDF document text
    • https://xorodipilubila.weebly.com/uploads/1/3/5/3/135311864/9c4e4c9.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/jgShebJ/youtube_for_android_tv_box_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/jaVjdgj/xofaxubefodopeg.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/hYjjFji/46113020500.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/cjdLFat/72248380285.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/hg7ieXv/acer_predator_helios_300_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/XtjbYig/wepaze.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/LLISuij/snowball_effect_sentence_examples.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/dejolavubukugeb/bronto_platform_saddle_level.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/usb_charging_cable_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/xifinarisuji.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/ardas_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/43283373887.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/dugamizesavere.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/change_bitmap_pixel_format_c.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/69491717449.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/the_girl_who_owned_a_city_characters.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/most_energy_efficient_electric_fireplace_insert.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 5048 bytes
SHA-256: f287f881202a297e86199edb2fa3ff55c0d1db1430786c4ef3500ee71eaad7ea
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 12484 bytes
SHA-256: 771de844f80674f958094d18f132c2272f71d7fe10d1c6d966888f9f6fa21308

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