Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8e5ee4cdef7b76…

MALICIOUS

PDF

80.8 KB Created: 2021-04-21 22:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 549c6735b1a652b498e1ee2f1b4833fc SHA-1: 596f2f60fb80f0f00f3e27737be08fdd34967c51 SHA-256: 5d8e5ee4cdef7b768db3c10ccbfb11276b5a52868da2426212854033d623f09e
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 0.9998

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://resalured.ru/strik?utm_term=written+story+of+fifty+shades+of+grey+movie PDF link annotation
    • https://siwurarililoto.weebly.com/uploads/1/3/1/4/131453181/vizamu.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/79886141440.pdfIn PDF document text
    • http://lezofifividex.scienceontheweb.net/pupasixukiru.pdfIn PDF document text
    • http://pubgucbayim.com/gejizixejalewakaf2bj8q.pdfIn PDF document text
    • https://bisenazogogo.weebly.com/uploads/1/3/4/6/134686343/bd82cf3.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/danilodiwap.pdfIn PDF document text
    • https://nulumekut.weebly.com/uploads/1/3/4/3/134373747/6103897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499317/normal_5ff1df7f19fb9.pdfIn PDF document text
    • http://ru-1.casa/66971044755uhjvw.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/Bgijn4l/are_there_cruise_ships_still_stranded_at_sea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_60619c05d5211.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/51f4d4.pdfIn PDF document text
    • https://cdn.sqhk.co/rupelesegeb/5roQ1ie/33241000958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/81204747306.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/wopemim.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/80376920368.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/16025069230.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_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 5464 bytes
SHA-256: 37b14049389986d83a0cfd56d644571bfb2921827c2358123269e1805fe6ea48
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 10872 bytes
SHA-256: 8bb45022c87a5ceb739f655677972d071a3a158351447738e145049a4664e671

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