Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14c359440377c85…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 23:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 16751f635ef5830c8d75e18c857cbbd4 SHA-1: cf087dccc6e9af9df377e455ca2e4642fda0869c SHA-256: b14c359440377c850fd1f81ac9984e8edb29f3683977e9c3ee3de78e66e980eb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary one pointing to a suspicious domain associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=calligraphy+a+complete+guide+pdf+free PDF link annotation
    • http://boforotaje.mywebcommunity.org/how_to_treat_blind_pimples_on_forehead.pdfIn PDF document text
    • http://megahit.space/tajegasujodifufawukozuvoga6pl.pdfIn PDF document text
    • https://siwuluwavati.weebly.com/uploads/1/3/4/7/134756127/7376818.pdfIn PDF document text
    • https://rugovisatef.weebly.com/uploads/1/3/2/6/132682701/7933775.pdfIn PDF document text
    • http://todayshop.website/witulanunoxiwesopalaqzi47.pdfIn PDF document text
    • http://xagixowedobosab.medianewsonline.com/dunoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483097/normal_5fc9be7f4eafb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_604dd58aa4002.pdfIn PDF document text
    • http://pokemonrivals.online/why_is_my_dvd_player_not_reading_discsu33cj.pdfIn PDF document text
    • https://welafunugor.weebly.com/uploads/1/3/5/3/135327357/lumuzipunopufano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474727/normal_5fdfbcb40370e.pdfIn PDF document text
    • http://raisinslabs.club/danby_dehumidifier_with_pumpo1gcz.pdfIn PDF document text
    • http://openplafond.xyz/57355003418olqi3.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/nolarifaforuxop/waiting_for_love_lyrics_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da620d4f-0b1d-4cd8-a5ff-4a40fae6ca47/a_raisin_in_the_sun_playwright.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/traductor_de_espaol_a_ingles_con_su_pronunciacion_escrita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0140bf54-3e09-44dc-bf56-09da7d8d5efb/asus_xonar_d2x_xdt_a.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/40980038638.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/guide_ivern_top.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/table_list_bootstrap_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0a714c-e231-4102-b5ce-430f4295b11a/educational_psychology_textbook_definition.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_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 5400 bytes
SHA-256: 65cd7b680169edb23f35e1a12984cf4e4a8604ca92f18519f40781f216753af1
font_01_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 11024 bytes
SHA-256: e848b538109f97dbd6b64359b700d7b21ac8ccebb05db3178d43aee7fecf0e9a

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