Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f636a2ad5e6d161…

MALICIOUS

PDF

81.1 KB Created: 2021-02-20 21:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c39427c3a0b594f9e84f6b94cef40d3a SHA-1: 4de05ca05952c1aa12fe515d36ad74f4d8aa4863 SHA-256: 0f636a2ad5e6d161007b1bf92567ec6233dcd19eaf8256e15910f72a4b3b08dd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=basic+drawing+classes+for+adults PDF link annotation
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/nanixeretolomakela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421623/normal_5feb63460a89d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410714/normal_5ffb636b17c09.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/wonder_book_read.pdfIn PDF document text
    • https://govumiseli.weebly.com/uploads/1/3/1/3/131380651/7642752.pdfIn PDF document text
    • http://majijeniwadimu.22web.org/bahubali_hd_songs_tamil_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_600ceea166385.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/wobeki_bekigunanigijob_bidulibeponilis_pakiw.pdfIn PDF document text
    • https://fuwiwidiwijidex.weebly.com/uploads/1/3/1/6/131637339/49aa70b9e.pdfIn PDF document text
    • http://vukogosapejofa.iblogger.org/79318904490.pdfIn PDF document text
    • https://rigegafotu.weebly.com/uploads/1/3/0/7/130740045/damokadijagunopor.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/xaliwalufoguni/airfix_dogfighter_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/metformina_500_farmacias_similares.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/adobe_acrobat_reader_12_free.pdfIn PDF document text
    • http://wolaxagemir.rf.gd/agneepath_full_movie_720p_openload.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_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 5328 bytes
SHA-256: 26191e072269e860664c4b9f9bd377d1ed6d958198e830f861afcfd00e1f34c1
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 10472 bytes
SHA-256: 7568bb503d29d4c5df2f7d1d74bc3b1fcf96d37f36ed32474d593e9ea606035f

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