Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec858a3878a9df0…

MALICIOUS

PDF

89.7 KB Created: 2021-04-07 02:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2ab6c00e6c6c6ea37315b9fb95afeb74 SHA-1: 327eb32f8e574b3121181b50036e4759b3bf08fd SHA-256: 5ec858a3878a9df0227bbf15b75353921cd83ae7eab957f421b548e67775feea
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, consistent with a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of external URIs suggests an attempt to redirect the user to malicious content.

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
  • 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://jumiwimov.ru/wix?keyword=dave+alexander+facebook PDF link annotation
    • http://alluniversity.fun/non_formal_education_definition_sociology9r99u.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/7526726739olr1u.pdfIn PDF document text
    • http://komakukamuduwi.iblogger.org/widol.pdfIn PDF document text
    • http://itanah.space/90243086914ru82s.pdfIn PDF document text
    • http://adanakebap.org/53859417478x1x47.pdfIn PDF document text
    • https://guxenakab.weebly.com/uploads/1/3/5/3/135393472/6070186.pdfIn PDF document text
    • http://tejaberi.iblogger.org/70498408584.pdfIn PDF document text
    • http://pumba-timon.space/human_fall_flat_online_pc_unblockedoz336.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/darega_zibezeterulaka_funibiketeda.pdfIn PDF document text
    • https://lalevajapogos.weebly.com/uploads/1/3/0/8/130874146/megomasifusimeb.pdfIn PDF document text
    • https://falitevegenos.weebly.com/uploads/1/3/4/3/134321562/3fa07.pdfIn PDF document text
    • http://podarokinsta.site/lord_of_the_flies_chapter_8_review_questions_quizletie8jh.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/0104ce2c-8f91-4dee-8094-302095a753d8/ge_capital_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/english_to_filipino_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/how_to_reset_samsung_tab_4_without_password.pdfIn PDF document text
    • http://nidolivudazos.rf.gd/surah_al_ruqyah.pdfIn PDF document text
    • http://tutazena.epizy.com/58188704391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57e60bd-7557-438e-b9ee-b1d0201423ff/maravilloso_desastre_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ae7d3e-9c5e-48c5-adaf-266988a038fe/myra_breckinridge_movie_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61d692b-9933-4e96-8bd1-04f2cea5b0f8/wordpress_login_not_working_after_url_change.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/13341763121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7bfe692-6131-4bf2-bbbe-393f193ec7be/go_ask_alice_by_anonymous.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_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 5168 bytes
SHA-256: 61f82659bd080d0c261040b4ec4ed459fae86075eba6ed35be2d5e65de3f76ad
font_01_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 12768 bytes
SHA-256: ac02471b8912335c5aa4af5f84406025e73c19d8ed4c74221cdbda90068141fd

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