Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48ea5e67f90a890…

MALICIOUS

PDF

83.7 KB Created: 2021-03-10 00:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2544326c2c7000452caa93f0017175e7 SHA-1: f2d82265dff01011971254dcb1ab2be6459e6c5d SHA-256: a48ea5e67f90a8905fbcb7695616d05e9c9c71bb4595fd9d2320e4fef351a410
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating that some link to known malicious redirector infrastructure and a link farm on disposable hosting. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of numerous suspicious links suggests the document is designed to lure users to external malicious sites, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=sda+bible+commentary+genesis+to+revelation+pdf In PDF document text
    • http://lakujalinifibo.mypressonline.com/what_are_the_8_parts_of_speech_with_meaning_and_examples.pdfIn PDF document text
    • http://kvyovk.xyz/nobumew3t6lv.pdfIn PDF document text
    • http://3gusevshop.space/ask_siri_zero_divided_by_zero_answerdfqop.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/kivarefoxegavowikeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6022d156ee33f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_6009f7ebaa1fb.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/why_is_bright_tv_ma.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/simpson_pressure_washer_hose_lowes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vazirap.rf.gd/scary_stories_to_tell_in_the_dark.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/mathematical_induction_proofs.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/ccma_dispute_referral_forms.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/gulesokabiretozakara.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/atkins_diet_meal_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/hueso_cuneiforme_medial_partes.pdfIn PDF document text
    • http://pujumek.myartsonline.com/50887381965.pdfIn PDF document text
    • http://juzavogubi.rf.gd/lemenipagalegaxijotexaba.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/does_tegrity_record_your_screen.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_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 5880 bytes
SHA-256: dcc689bc06e64c7e48133792852101343595b16ebfc3dc828f62bf5368ff0254
font_01_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 10368 bytes
SHA-256: 2d1265981878a68ab84e69e00bd3a1ea8913ec0cfba2260e80342d93636e1a8b

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