Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e979687738f08bf…

MALICIOUS

PDF

72.5 KB Created: 2021-02-08 20:39:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 27a8a6c7d659dc28faa31f62e9ad6978 SHA-1: 9906d82d5f5e872837801da38b99a9319dc169dd SHA-256: 6e979687738f08bf83b57176bc9cf3caed34b152721e17980f96802974e05e7a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing users to 'jottigo.ru' under the guise of a worksheet. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to exploit users via a social engineering lure.

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://jottigo.ru/wb?keyword=jumble%20word%20puzzle%20worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411717/normal_60106b011c4d9.pdfIn PDF document text
    • http://pabukelib.66ghz.com/80750883114.pdfIn PDF document text
    • https://limotesatax.weebly.com/uploads/1/3/1/8/131871768/kofegusozo.pdfIn PDF document text
    • https://fevujuwevu.weebly.com/uploads/1/3/0/8/130813851/vewuwigezo-mamiganoxupinak.pdfIn PDF document text
    • https://naratejog.weebly.com/uploads/1/3/2/6/132682615/1855635.pdfIn PDF document text
    • https://folodekoj.weebly.com/uploads/1/3/2/8/132814523/61967190429cc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_60177a81bcbe8.pdfIn PDF document text
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/talezane_jegutulo_wisosiv_piwifedinapu.pdfIn PDF document text
    • http://petersikdar.com/child_abcd_video_songsnsn3n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5ffcb75cb0df4.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/38470643992u4q5m.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/xezonijida/free_lagu_back_in_black_ac_dc.pdfIn PDF document text
    • http://zevofelajasuz.epizy.com/14067779200.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/1911_armorer_s_course.pdfIn PDF document text
    • http://wewenak.rf.gd/hardness_of_water_experiment_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/bomber_friends_game_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/ligugojisomuluni.pdfIn PDF document text
    • http://munakazoxan.epizy.com/macandrews_forbes_incorporated_annual_report.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/illinois_annual_report_allocation_factor.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 5324 bytes
SHA-256: 2e23dc1b5a5a7c88192b36f8cdd1a4c167671930b1088145c49b4b3c79b7a025
font_01_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 10736 bytes
SHA-256: daf600f23bc767f5a7451fe1950c8dd6d15d24f53ef144ec39dd45bfe04dd447

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