Malicious PDF — malware analysis report

Static analysis result for SHA-256 44303699cb41951b…

MALICIOUS

PDF

80.0 KB Created: 2021-04-05 17:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: faabf1378164265b138a06bc11de3e13 SHA-1: a72e503a7973e16643101751145bfde20c66f323 SHA-256: 44303699cb41951bebd00b33cb1e4bdc024c027219ba8088e0a6e286d5900ca3
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with one prominent URL pointing to 'ponafet.ru', suggesting a phishing lure related to salary information. The PDF structure also indicates it's a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=how+much+do+planet+fitness+assistant+managers+make PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405929/normal_603f1b67785a9.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/portuguese_to_english_converter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_6027f7be17f80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ff9117c269e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_602ffb458aac0.pdfIn PDF document text
    • http://fefogumok.22web.org/astro_first_hantu_kak_limah.pdfIn PDF document text
    • http://wutoniwes.iblogger.org/99727136870.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/interview_tips_for_teachers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_60653e0a17c3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454670/normal_5fe051eb89753.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/nifadikufukuregosotog.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/bumukelekujemurajefuj.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/zasikapazexokogivapakewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_602066e1e673e.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://xazawipobu.rf.gd/business_law_case_studies.pdfIn PDF document text
    • http://butevagowug.epizy.com/53838419657.pdfIn PDF document text
    • http://gamupuzif.epizy.com/directional_terms_worksheet_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/chair_conformation_newman_projection.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/rexogokegepedefojud.pdfIn PDF document text
    • http://zoruzinifade.epizy.com/83272070866.pdfIn PDF document text
    • http://lakelasu.rf.gd/influencer_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/dolijese.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_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 5568 bytes
SHA-256: c15cd7b82808b04220e7c979ce27db709a83ecee6ca2759681683617b2707d4b
font_01_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 10952 bytes
SHA-256: c6c2999d728f50538fbd78d05b0a26507af18398480f551bba9a9e7d6e92e97c
font_02_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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