Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a9168ebbfd3e27…

MALICIOUS

PDF

76.1 KB Created: 2021-03-05 09:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7f96ba1b669a575b14cd8ba8e6569c55 SHA-1: d2256fff5c16b82f11087878a789dc250fb1cd50 SHA-256: b3a9168ebbfd3e27a5cd158ac7c860295725694459a0f5f9c363103099644a9c
134 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Louisiana purchase worksheet answers', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bologen.ru/wix?keyword=louisiana+purchase+worksheet+answers PDF link annotation
    • http://regsenatvumen.website/chord_piano_chart5rxv3.pdfIn PDF document text
    • https://cdn.sqhk.co/doxanusubomo/xeggj5J/ganapelipafutusoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/zadirajuviku/iiaihVd/toronto_travel_guide_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5ff5be91c2dfb.pdfIn PDF document text
    • http://about-igsupport.com/536857320399u5cu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_603dde99997a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5fca102e579a1.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/ogjgj74/86991767578.pdfIn PDF document text
    • http://netewe8.xyz/jagatugawejevsrjah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_603c694486e65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451021/normal_5fe910a3e0fca.pdfIn PDF document text
    • http://4bochki.ru/todebudutupamowabmpd.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/jihi2ih/8086395467.pdfIn PDF document text
    • http://shortsomfj.space/bashment_time_riddim_songsop9gm.pdfIn PDF document text
    • https://cdn.sqhk.co/rizakumer/jfFfhe3/9802360166.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/1f6c5b06-14f9-4cae-8581-618d742901dd/what_is_an_example_of_order_of_operations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1288661-484d-4af8-ad8e-7e52a960c54e/70653118074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096fe3d1-eeaa-457d-bd84-1221e884bac1/96748984307.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/5619478075.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/29532862265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bc564d-552b-4386-af6d-1fa2cf2a2cc2/zupufebalugokakafomora.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/shivajiraje_bhosale_boltoy_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/bottom_navigation_animation_android_github.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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 5088 bytes
SHA-256: 5efb74c18f5e6e8609cf42bc17b38dd7da6bcd744a0048d7f830aab46aeb5e44
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10428 bytes
SHA-256: 69fce469ab947e9d2131524e25060f3ba718aafe6674166618b6be8481490f47