Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8c609f1ee606b2…

MALICIOUS

PDF

83.0 KB Created: 2021-04-03 00:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 96647ddb10e3f283cce36c63bfe01ef2 SHA-1: 152c0177ab278d4b882dbb1845ab14eab1891fc2 SHA-256: 0a8c609f1ee606b25f34fd1f6f3e393b433bdd9209881acb919b6d6c9153a7ee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to other PDF files, which is indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the structure and numerous external URLs point towards a malicious document designed to lure users to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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 http://bewugexujiz.iblogger.org/jenagusadapixoli.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4497356/normal_5fcf24df6e062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5fe87b9300d4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_604aca05ddce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_6025c41785a6d.pdfIn PDF document text
    • http://mifilud.iblogger.org/spacex_wallpaper_android.pdfIn PDF document text
    • http://wimudevereru.sportsontheweb.net/badasidatumil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_60183aa3c5c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_602d225b7cbc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_602f6f91ccde4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/WboozbXZlIE/wb?keyword=5%20weaknesses%20of%20the%20articles%20of%20confederation%20and%20solutionsPDF link annotation
    • https://s3.amazonaws.com/tidigudetefumof/minecraft_brewing_chart.pdfIn PDF document text
    • http://zesukojuwuveg.rf.gd/35616417124.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/anita_anita_songs_ing.pdfIn PDF document text
    • http://tirawuko.rf.gd/marine_navigation_apps_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/wizards_unite_halloween_event_guide.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_1e2c6bb6b1f748fd84ce089fc7297790.pdf?index=trueIn PDF document text
    • http://zuputes.atwebpages.com/kerojufiwagag.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_dc28a861826f400d9cd051e49ec24b8b.pdf?index=trueIn PDF document text
    • http://wumugajus.onlinewebshop.net/business_letter_writing_notes.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 5296 bytes
SHA-256: 903ef28fb2d33b4755f3fae6c5c2262ef4a71744257cd3a7b4d548bee0141ce7
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 7688 bytes
SHA-256: 8161977709c4381ebc517b53a3c6cd37ac57b5b4d1710fcea689e6447213d1bb
font_02_sfnt_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 10564 bytes
SHA-256: afe74b079585dda15bed84b9e628ba1e08cddec03c9bd7bbcc139859a47111a3