Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3879ddc9654f62…

MALICIOUS

PDF

73.8 KB Created: 2021-04-01 22:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4f6d222cd3bdb486c31bf33ce941de61 SHA-1: c495e1e135e6bdd2d5492ab7cfe14639f4d3f02e SHA-256: 1f3879ddc9654f62d1f2dbf7d57748b65353b185f74889ce78d74e09f765bf8f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=jarir+bookstore+brochure In PDF document text
    • http://job-finder.space/solo_parent_leave_act_philippineszcfnj.pdfIn PDF document text
    • http://xsale.trade/gate_2018_ee_answer_key_with_solution5em5y.pdfIn PDF document text
    • http://worldhold.online/8606606912sxwzi.pdfIn PDF document text
    • http://xususebixaxix.iblogger.org/duvegizibuzafarupoz.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/shambhala_the_sacred_path_of_the_warrior_summary.pdfIn PDF document text
    • http://lufafawowe.iblogger.org/97386047021.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/dekiruraxizapi.pdfIn PDF document text
    • http://sallehub.xyz/briggs_and_stratton_small_engine_oil_sae_30_msdsquqmc.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/46225529724.pdfIn PDF document text
    • http://majikok.mygamesonline.org/26432715667.pdfIn PDF document text
    • http://fragcups.com/pottery_3d_mod_apkjqyrx.pdfIn PDF document text
    • https://lisevududotuwak.weebly.com/uploads/1/3/4/2/134265384/5798808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/019d5041-5c4f-428a-8efd-d7b1e2c65d17/estudios_de_casos_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/christmas_day_wallpaper_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/engineers_black_book_2nd_edition_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28f7648-c8a5-474c-8a2c-2df4b6d7b05a/how_much_is_a_sun_tracker_pontoon_boat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8612bcef-9d00-4e2f-99f8-0a4673f102af/53707742311.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/everyone_an_author_with_readings_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb14db1-2b7a-45c6-b4de-06ac66540e35/beginners_strength_training_program.pdfIn PDF document text
    • http://guraxitadaji.rf.gd/clinical_examination_of_cranial_nerves.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/does_chick_fil_a_grilled_chicken_have_msg.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 5048 bytes
SHA-256: 6c8c262d69d072839480c2ac01128ff19fdaa5ec242441d47298a67790e06c92
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 10940 bytes
SHA-256: 2d3f372f2c4d10a095a2df249c1c25c7be95d7bad15630aa757e9affe0d0ffd3

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