Malicious PDF — malware analysis report

Static analysis result for SHA-256 328a56016fabf512…

MALICIOUS

PDF

77.5 KB Created: 2021-03-29 07:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3ed1fe8ec1f878cd755b33ebb74624df SHA-1: b31abca46e49022c88bf1f86b0af135bb96fd7d7 SHA-256: 328a56016fabf5128f80eb6d934b761ff425114d09b726adc3e2f733e8db972b
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 0.9991

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://xezojetit.ru/wix?keyword=water+pennywort+care PDF link annotation
    • http://naxuvazexipok.sportsontheweb.net/food_stamp_office_phone_number_bryan_tx.pdfIn PDF document text
    • http://lnstagramoriginal.com/peter_pan_shrek_the_musicalbyhs4.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/derelilakukab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_601d6255e895f.pdfIn PDF document text
    • http://winnerslm.space/herbert_l_clarke_technical_studiespau4o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_6018e48cec271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5fe4513172b2a.pdfIn PDF document text
    • https://gigadejelurare.weebly.com/uploads/1/3/0/8/130874533/labelovigokudukiba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5ffe158a1d270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5ff26e4391238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410002/normal_6001964477d10.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/xivirifubovo_mifej_dakok.pdfIn PDF document text
    • http://inmyshtangen.xyz/83364353364u0j7x.pdfIn PDF document text
    • http://kmplitka.shop/992730462869j50j.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/adjoint_algorithmic_differentiation.pdfIn PDF document text
    • https://rulovukefaz.weebly.com/uploads/1/3/4/7/134712077/soratanigidim_rabari.pdfIn PDF document text
    • http://stavki.link/bosch_series_6_silence_plus_dishwasher_manualz3vli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_605b3c3967493.pdfIn PDF document text
    • https://vusimipemukebev.weebly.com/uploads/1/3/0/8/130814393/6f121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_6049a20fd2ec8.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/wazagidonux/jinja2._exceptions._templatenotfound_index._html_flask.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/mere_christianity_book_3_chapter_8_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/51035322393.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/pelibirefakegor.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_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 4924 bytes
SHA-256: 4f02ff3e0d94fc77ccb56267402e2b4b749abbcc455dec77683f3c901696385c
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 10788 bytes
SHA-256: 4a262df855d8c4f8d636b93ee5f54f0a96430e55f99ffe6a2622346f244cefcb