Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a905c548cae0d0…

MALICIOUS

PDF

72.5 KB Created: 2021-04-02 09:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 61300df8ebe8593a57ca0a5ecd852699 SHA-1: a113deb07c4f723de95c2be9b07394367612d971 SHA-256: e3a905c548cae0d01f941c3ada1c8509008b6cf89b34c00dff657e67d85632a2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged the file as malicious, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=budismo+pdf+dalai+lama PDF link annotation
    • http://ogranicbio.space/coleman_presidential_3_furnace_filtern54n9.pdfIn PDF document text
    • http://antonioita.fun/tafsir_ibn_arabi_franais0fqak.pdfIn PDF document text
    • https://lopomibuliwipa.weebly.com/uploads/1/3/1/3/131381919/webusadefis.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/siaKAgd/maggie_s_movies_camera_action_mod_apk.pdfIn PDF document text
    • http://ecoservice-vlad.ru/the_norton_field_guide_to_writing_with_readings_and_handbook_4th_edition_ebook2r1ug.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/sosufe_bipimewu_zogorixifumi_dozigewugolo.pdfIn PDF document text
    • http://larekew.mywebcommunity.org/distinguish_between_public_finance_and_private_finance.pdfIn PDF document text
    • http://premium-cinema.com/omron_bp742n_5_series_upper_arm_blood_pressure_monitor_costcoa4mc4.pdfIn PDF document text
    • http://idealsit.space/kemper_profiling_amp_manualx9qja.pdfIn PDF document text
    • https://mipurokuniveg.weebly.com/uploads/1/3/4/5/134508865/bugalojow.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/54481177515.pdfIn PDF document text
    • http://supsun-aero.com/97440372503us5ey.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/jaiidgg/basic_english_grammar_books_free.pdfIn PDF document text
    • http://ighelpcenter.xyz/88953818829b72zx.pdfIn PDF document text
    • http://yildirimotobursa.com/vorimorulumibogogi3nrim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_17d5257fa3d4443182b555c5c31f2b2b.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_30d6b979b0924ef798e8268ac00037cf.pdf?index=trueIn PDF document text
    • http://gezixus.myartsonline.com/how_many_basic_crochet_stitches_are_there.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_348248dc6e7746f5b64f46dc2190b84a.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_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 5140 bytes
SHA-256: e9db90290ce050142dc23e54ec756e701bf7d4523074ee386a0a1f1371a2c333
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 10048 bytes
SHA-256: 8d8e5124c4abad3fc64df22ac7e8e6648b08cf837d25511da45173e587929745

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