Malicious PDF — malware analysis report

Static analysis result for SHA-256 61348909dd2ab291…

MALICIOUS

PDF

71.0 KB Created: 2021-03-30 04:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c2dde217aaa120bc7ef86134b54357d SHA-1: 776204a8e984b0280720992a46d38e07868613a4 SHA-256: 61348909dd2ab29170cdaed575297a34f3376abe723efeca65b68de572ea39bf
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is 'https://yafferge.ru/award?keyword=array+concept+in+c+pdf', which is likely used to redirect users to further malicious content. The document's structure and link farm behavior suggest it's part of a phishing or SEO poisoning campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=array+concept+in+c+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_5fd813adda366.pdfIn PDF document text
    • https://tuxonojetivap.weebly.com/uploads/1/3/4/4/134437157/vuvokavovifa-vopunavi.pdfIn PDF document text
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/fusovon.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/9513b6c9.pdfIn PDF document text
    • https://cdn.sqhk.co/buwozumu/fjbajde/unlimited_gold_twoo_meet_new_people._apk.pdfIn PDF document text
    • https://lezezirurebox.weebly.com/uploads/1/3/5/9/135967023/gidudegulefakamefaji.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/lajevasokidix.pdfIn PDF document text
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/450610e.pdfIn PDF document text
    • https://vefapabawi.weebly.com/uploads/1/3/0/7/130740427/928650.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/6926922.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/fjhv7jf/wulovuzadofesato.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/Wgfhcrz/all_in_one_preschool_books.pdfIn PDF document text
    • https://zelogevoge.weebly.com/uploads/1/3/1/4/131483318/mimenab_punajiduje_mekip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_604705873140e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530070/normal_602891db014eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_5fe68d392848a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_602ca2c1147bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3dfcfb-4f68-48c8-ac71-dabcaa1c33f8/gexelezog.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/56228732545.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/external_style_sheet_css_w3schools.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/blank_monthly_calendar_template_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/best_hd_wallpapers_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/631b6078-df3c-4b70-bc53-5a6e5b7f91de/how_to_fill_bobbin_on_old_singer_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27ef04e-63ee-4bfa-a3b0-58aa525624d6/drinking_quotes_coffee_mug.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/riwowobetipemiwowemifev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666bac68-72cd-4390-8400-df71200b7283/how_to_prepare_for_an_ecg_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8b2313-fe44-40f6-90b6-520837901f4e/par_quoi_remplacer_le_cognac_dans_recette.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_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 5028 bytes
SHA-256: 25a85c44bcb29d46ae6241ba4509369011812a588e5b7aa32dc112443a20bba8
font_01_sfnt_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 10776 bytes
SHA-256: 9f15fdea36f98e304e1bb5e72cbde0fb6b350b0e0d42f1b2ac93c97778cbc225

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