Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df1802cf110dee8…

MALICIOUS

PDF

117.4 KB Created: 2021-02-21 16:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e8306926bcab0b1c23a575d9cb676d31 SHA-1: 5531bf19584692eaf801e34a2f30c4ac511c9e64 SHA-256: 7df1802cf110dee8e9c84fca6a101393b5c4a3c6ff9ec00018d7ae4af0065446
126 Risk Score

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://bologen.ru/wix?keyword=plate+tectonics+vocabulary+quiz+answer+key PDF link annotation
    • http://togusavek.22web.org/32487753512.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/tesawivikuxinuxize.pdfIn PDF document text
    • http://bumomuvo.iblogger.org/41684051751.pdfIn PDF document text
    • http://zatorigixoluji.iblogger.org/charitable_contributions_request_form.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/kaderaxog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_6025bbae696db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_6001a4e9ee96d.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/9734338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd60f4fe85a2.pdfIn PDF document text
    • https://kesaroxet.weebly.com/uploads/1/3/0/7/130775747/7394669.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/napimi.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/kitakilesa/53431414744.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/ct_renal_angiogram_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/wejiba.pdfIn PDF document text
    • http://tefabawamibane.epizy.com/coolrom_juegos_para_android.pdfIn PDF document text
    • http://siripuxem.rf.gd/song_bepanah_pyaar_hai_aaja.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/79486422317.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/template_literature_review_table.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_off0001915d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1915D 5428 bytes
SHA-256: 4733947c173f6cb93e437a6fa2553ed656fc274a475d5270d8835469127ac69d
font_01_sfnt_off0001a412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A412 10488 bytes
SHA-256: 19c9303944c923aca8dd39210dcfebda40a2a1a1c28653553a488948a4816160