Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8788cd62942f9f…

MALICIOUS

PDF

101.2 KB Created: 2021-04-07 15:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8b342f58d7b6a38fd233d3805199d468 SHA-1: 5f343d2bd613de783c2e37ea6c443bacbd74e98f SHA-256: be8788cd62942f9f54ba81b330c64c806b235a9e0d3ec741db5756ec726a2ee2
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically pointing to 'leonvi.ru/award' and another to a link farm on disposable hosting, suggesting a phishing or spam campaign. The PDF structure and embedded links are indicative of a tactic to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://leonvi.ru/award?keyword=causes+of+brain+cancer+pdf PDF link annotation
    • https://cdn.sqhk.co/jeporikate/jiw3ijz/79509149471.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/pathfinder_kingmaker_companion_builds_gog.pdfIn PDF document text
    • https://fajimidisuwa.weebly.com/uploads/1/3/1/6/131606183/posowovapevo-jokifubukopow-melozufemojelep.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/lubijifatokexem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_606c4b2428444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_6027a72b9086c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_605326b767d61.pdfIn PDF document text
    • https://cdn.sqhk.co/takepoladev/6wOqJgG/12842368377.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/80125966600.pdfIn PDF document text
    • https://cdn.sqhk.co/zevukodixu/iggjchb/xolipusejubiliwigaviwev.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/ieij0hi/manual_de_supervivencia_zombie.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/tofivefixebovopodez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388177/normal_5fca316ad267e.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/giKJje7/bulleit_bourbon_distillery.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/xugifakuj-nituv-vumofu.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/070cc49cc1c6b99.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/nawasid_kebexizuxiriro.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/leadership_style_assessment_test.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://mugazukadum.onlinewebshop.net/1280548603.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/fuwonarabig.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/1_cal_to_calories.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/18264351725.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/alliteration_assonance_onomatopoeia_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/wijataxoxim.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/94274901636.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/80109463783.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_off000142ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AB 5084 bytes
SHA-256: 819bf99b3a145e583264963a134e67783c1572dcebfb0f83487b25b89aa660b3
font_01_sfnt_off000153f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F4 10736 bytes
SHA-256: b152b9e1e1e1fa580663f4b1051ab183af327a9b97bfbb750d8de2f1f5263cde
font_02_sfnt_off000178b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e