Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6970b20bab92bc…

MALICIOUS

PDF

160.6 KB Created: 2021-03-18 19:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87c6c9283ed7d73719aba33a6bc8477f SHA-1: 9b6ca47d078afde628c36729dac150d9cdb78870 SHA-256: 8f6970b20bab92bcc840df1ed9a22a9882e6428408e70d7367e347c4aff0ecec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://crophysi.ru/strik?utm_term=organizational+culture+theory+describes+and+predicts PDF link annotation
    • https://wediwubogeken.weebly.com/uploads/1/3/2/6/132681674/5a31a476abf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5ffd07bfe329b.pdfIn PDF document text
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/4748156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_604b40e5a1072.pdfIn PDF document text
    • http://vuwevemup.22web.org/salenotufira.pdfIn PDF document text
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/timilowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_601765db998af.pdfIn PDF document text
    • https://guzuwifaxad.weebly.com/uploads/1/3/4/0/134096987/xederodusetevonib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5fdabae37b5cd.pdfIn PDF document text
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/800eb948c.pdfIn PDF document text
    • https://mazakodavowur.weebly.com/uploads/1/3/4/3/134335882/f93f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5ff25854996b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5ff16858a78eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzotekekejepun.rf.gd/31932463277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63309190-328a-408f-90a5-17cd37e22492/what_is_the_difference_between_centripetal_acceleration_and_centrifugal_force.pdfIn PDF document text
    • http://jamiwurono.epizy.com/manual_guitarra_espaola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d06125-b474-47ad-b081-72c3a4793dcc/what_does_moral_conflict.pdfIn PDF document text
    • http://barirenuvekesup.epizy.com/narcissistic_personality_disorder_symptoms.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_off0002323d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2323D 5656 bytes
SHA-256: 8769d295cbae56f11ddb428b13cba363e3018252501f76843285478af9ecd22a
font_01_sfnt_off00024573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24573 14156 bytes
SHA-256: b1b5b7ac372e4abcf660cce41e659cfa263a71ac33f3f773b0a60fe9a8bfe43f

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