Malicious PDF — malware analysis report

Static analysis result for SHA-256 8577066ce8622067…

MALICIOUS

PDF

79.6 KB Created: 2021-02-26 01:35:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 86e5bdf5374220a130f81e6d55b385e9 SHA-1: c586f47838ff0c5f9d916283033ce1ab3cab4479 SHA-256: 8577066ce862206772eb3c6485d51d5051262871cc94eb7d55e71642da11a373
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a prominent one leading to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into navigating to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=the+book+of+secrets+full+movie PDF link annotation
    • https://faxuritenorajap.weebly.com/uploads/1/3/4/5/134585079/d7dba5db5e46.pdfIn PDF document text
    • https://cdn.sqhk.co/bataseset/m7uLPjj/great_battles_medieval_xbox_360_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/fgdpAha/business_administration_associate_degree_salary_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/bgh4Etn/swat_movie_2003_cast.pdfIn PDF document text
    • http://norukirabo.iblogger.org/bakimifi.pdfIn PDF document text
    • http://grenkasalo4.xyz/how_to_make_my_smaller_macqhi0k.pdfIn PDF document text
    • http://bathforlegs.xyz/550169063130g26m.pdfIn PDF document text
    • http://cenderaoriginator.com/they_say_i_say_academiaa9ba5.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/email_templates_responsive_free.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/gorelovevegejexireno.pdfIn PDF document text
    • https://rimedugomo.weebly.com/uploads/1/3/0/7/130740195/wefosapizilidakudu.pdfIn PDF document text
    • http://winoorama.site/tigiruwedopebusotejiqd55r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gozuved.rf.gd/tuxujog.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/chahu_paas_paas_aana_song.pdfIn PDF document text
    • http://ximajaz.epizy.com/anew_ultimate_supreme_advanced_performance_creme.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/28889877787.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/wavedofivumorilarimij.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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 4900 bytes
SHA-256: 2bc1358203c5f1f64a3ed2513d141b9d16d394540dfaefe1fd5b6ffb27cc2498
font_01_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 10504 bytes
SHA-256: 9f1a428d6ea22f449e1f59127ab61a700758e8c87df21a97878c8506fda22ccc
font_02_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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