Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf0b0dc1f671916…

MALICIOUS

PDF

77.3 KB Created: 2021-02-27 07:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06240240385be58377f02123d4839a9d SHA-1: de767d796698e54cf42bbed9d52dd49968156ac3 SHA-256: 5cf0b0dc1f671916e50658f67aed46873d69b233ebd4ae237fd737909b073f5e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL pointing to 'bologen.ru', which is likely the destination for the phishing attempt. The document body, though partially corrupted, suggests a lure related to 'A doll's house play act 1 summary'. No scripts were extracted, but the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

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://bologen.ru/123?utm_term=a+doll%2527s+house+play+act+1+summary PDF link annotation
    • http://kukikifo.iblogger.org/retefatidus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457330/normal_5ff5a8c42fc44.pdfIn PDF document text
    • http://strgb2.ru/apache_jmeter_2._11_freewui5r.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/5264023.pdfIn PDF document text
    • https://xalojuxovev.weebly.com/uploads/1/3/0/7/130774978/0b96e8f8.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/6888714.pdfIn PDF document text
    • http://kpovli.ru/wexojalamigepozo39kge.pdfIn PDF document text
    • http://xiluzoxasefeb.iblogger.org/pinazewoponim.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/8185533.pdfIn PDF document text
    • http://gebovoxitim.22web.org/wavujuroxaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5feec53e3f093.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/daraniwekamidir/battlefield_1942_patch_v1_6._19.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/stigma_of_mental_illness_worksheets.pdfIn PDF document text
    • http://zuzogit.rf.gd/46683951037.pdfIn PDF document text
    • http://gugifeguxejuj.rf.gd/wikunebuf.pdfIn PDF document text
    • http://dawutanarav.epizy.com/seafood_recipes_book.pdfIn PDF document text
    • http://muxajetolalet.epizy.com/zelirexajigazigeno.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/fender_mustang_amp_gt40_footswitch.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/34949844632.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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 5492 bytes
SHA-256: 7c5e9716562970d67fe64e2eca2cb4676f0f97b2535e1fa2dd9a83d6647517a7
font_01_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 10228 bytes
SHA-256: 9615e7a8700fca0c2fff34b77cf0fd42e13298ed6156574944bfcf172831c195

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