Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5f9a53511749c0…

MALICIOUS

PDF

73.1 KB Created: 2021-03-14 07:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 196c61511e38c0cb77599ef82eefc38f SHA-1: c1cbac9adea6e43376a9b66b7226b6db5e4fbbba SHA-256: 2e5f9a53511749c0674a569f25619aaff7ff3cf9b8c7e003998161d6b976d156
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or engage in SEO spam. The document's structure and numerous external links align with techniques used to obscure malicious activity and redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://bologen.ru/award?keyword=volare+chords+pdf PDF link annotation
    • https://jafelabuz.weebly.com/uploads/1/3/1/3/131398525/6754398.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/fexaditozenomilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_600e5beba31f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5ff1934a6da62.pdfIn PDF document text
    • http://lamisorosasam.mywebcommunity.org/40622574878.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/lezepomadekux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_6011b43cc3939.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/f1585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_6025987343962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fd97aec63642.pdfIn PDF document text
    • http://damewumesigalut.medianewsonline.com/how_to_unlock_a_whirlpool_double_oven.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/pigimipujewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_6043091dcf72a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463559/normal_6039f7fb9a760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fe1aa90142b9.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/how_to_fix_a_kenmore_600_series_washer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boxijekew.atwebpages.com/90246718800.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_1ee71b1c35a240f9b7f0247ed0133e98.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_7ec50ed238a34dc897e9efc4f0a4e295.pdf?index=trueIn PDF document text
    • http://luvepel.myartsonline.com/aneurisma_aorta_adalah.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_5a37e588ad7e4c61bd1bd291d6ec21be.pdf?index=trueIn 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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 5208 bytes
SHA-256: 32eaccc045f763bf11e5bae8576772d30915e91527e153bb28bd819bdbad228d
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10732 bytes
SHA-256: e83a3c7713a94edc0ef2c3e1409db08adab950b859d0558d811cc3dcc8beb264