Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb38d744edf17114…

MALICIOUS

PDF

83.6 KB Created: 2021-06-11 22:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 54fe3441460660105c35e715517556fe SHA-1: 0786e84fae66bc0491e09f3144bb0ff5c3cc7917 SHA-256: bb38d744edf17114ba13b045d15cc6c534c11b0b212ae3660dc62a0748281c9c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, 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. No scripts were extracted, but the structure and heuristics point to a malicious document designed to lure users to external resources.

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 https://nomylo.ru/pbw?utm_term=begum+rokeya+biography+in+bangla+pdf PDF link annotation
    • https://tudepaweper.weebly.com/uploads/1/3/4/6/134607512/modatixapaxubi.pdfIn PDF document text
    • https://romasagato.weebly.com/uploads/1/3/4/7/134723475/wesapo_dipefumal.pdfIn PDF document text
    • https://gizajowi.weebly.com/uploads/1/3/4/3/134314542/7116377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_605c064c65a6f.pdfIn PDF document text
    • https://zulasiromeg.weebly.com/uploads/1/3/1/4/131453934/9ba132ba6894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6065c2ba6ee44.pdfIn PDF document text
    • https://paseboke.weebly.com/uploads/1/3/4/4/134432883/8601270.pdfIn PDF document text
    • https://fenagedel.weebly.com/uploads/1/3/4/3/134316540/moferamasu-tixavi-basovuna-ganubekosu.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/gewefod.pdfIn PDF document text
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/a859c96e390f387.pdfIn PDF document text
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/komanerewenis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420438/normal_6049376e263b2.pdfIn PDF document text
    • https://fanolukexepafo.weebly.com/uploads/1/3/0/9/130969893/1907f895dda3.pdfIn PDF document text
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/ligevoxexo_mobomif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_6044620481a41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_600f0485765cd.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/b34ad53a-82ca-4a3c-97f1-5ab7c25beaa9/76754657243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f052a1-67f3-4496-957a-6b4a90270947/printable_times_table_sheets_1-12.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_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 5632 bytes
SHA-256: a47aab1ce011a3ca35b9f34159925dcc17b2e2140e2c600236b3c445748e4d8d
font_01_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 10736 bytes
SHA-256: faf025bf4d47247b38f1bcc7a74bbba89a7c06edd2a67366a13bf1d993efc474

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