Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fd7bdb608f20de…

MALICIOUS

PDF

75.2 KB Created: 2021-04-03 22:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d7d067fc94d92679d3b54daa47b1172f SHA-1: 22137cfcd6159f54c9a81a5c33afbc215c1c85fe SHA-256: 56fd7bdb608f20ded51c763632b2a97e510be230cdae5363b25dfefe0f2cacbc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to distribute malware or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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://druttle.ru/123?utm_term=hungry+dragon+apk+latest PDF link annotation
    • http://gufutaca1.xyz/9397750070ew9mr.pdfIn PDF document text
    • http://doucheop.xyz/magic_bullet_printhead_cleaner_msdsbu6x5.pdfIn PDF document text
    • http://nesobaka3.xyz/25431721867eb3l8.pdfIn PDF document text
    • http://theporte.xyz/19572636471tp8bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_604ae088ab253.pdfIn PDF document text
    • http://recepty-dd.info/how_to_increase_the_size_of_an_image_in_paintwjeec.pdfIn PDF document text
    • http://erogan24.website/the_making_of_a_poem_google_booksbtvfq.pdfIn PDF document text
    • http://emmetrix.net/is_the_jbl_charge_4_louder_than_the_flip_4n4dp4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366647/normal_5fcbcfe57909c.pdfIn PDF document text
    • http://sarhello.online/24307637612a9140.pdfIn PDF document text
    • http://kismykeitio.best/bateria_virtual_pro_apkwsepc.pdfIn PDF document text
    • http://fastdonwload.space/pdf_converter_to_word_apkp3jzm.pdfIn PDF document text
    • http://uablog.website/sims_4_brittpinkiesimsunle0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_5fe3692f82a09.pdfIn PDF document text
    • http://tophomework.space/to_kill_a_mockingbird_by_harper_lee_free_audiobookyrqdk.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/ghfQgjh/kofamazeridogisarimuj.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/jdWgd1K/ccm_ice_hockey_skates_sizing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_600f22af0961f.pdfIn PDF document text
    • https://cdn.sqhk.co/gexedamej/jijigc9/55166243042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480389/normal_5fcfaba55f6be.pdfIn PDF document text
    • http://apelsins.space/bts_dope_dance_practice_mp4bgw8j.pdfIn PDF document text
    • http://songkfrk.site/renaissance_periodization_vegan_template_review85cox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 5252 bytes
SHA-256: f4cfb8bdff883bae8fad3eb1bd6a1b10ea2d01568a6e8b96f3273e1fbc017990
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10900 bytes
SHA-256: a325a5e9adbed3ae1c519e365769ea5da46d8fcf6907e6b7967d38830b19010c

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