Malicious PDF — malware analysis report

Static analysis result for SHA-256 57698f97510dbfe0…

MALICIOUS

PDF

168.5 KB Created: 2021-04-01 14:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f3d8b369bc08b912a0e94a689093d5b5 SHA-1: 590ad9b3a3e60f6a723ac575bb4a93c6c56d5af8 SHA-256: 57698f97510dbfe03929f4e4d808b33ceb2d54a75a1f99e7daf065dc86bf8d86
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that redirect to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the document's use of disposable hosting for link farming, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=adeptus+titanicus+titandeath+pdf+vk PDF link annotation
    • http://1-bog.ru/58608638089qbgwa.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/tuwinix7jgwg.pdfIn PDF document text
    • http://flowerport.store/generate_uml_from_java_code_eclipseb133v.pdfIn PDF document text
    • http://iceteas.space/78760738696m74ho.pdfIn PDF document text
    • http://vykupavto54.ru/farmall_super_h_parts_diagramk2ae4.pdfIn PDF document text
    • http://glawerry.online/digital_photography_school_posing_guidee3gu4.pdfIn PDF document text
    • http://pabixigenived.22web.org/9625535621.pdfIn PDF document text
    • http://brosbass.com/690755411572l227.pdfIn PDF document text
    • http://nat-yoga.space/658248091730cfne.pdfIn PDF document text
    • http://insta-sale.site/pokemon_heart_gold_goldenrod_city_gym_walkthrough7h5lh.pdfIn PDF document text
    • http://safetymirrors.xyz/bubble_fruit_one_piecestpdc.pdfIn PDF document text
    • http://criticcxck.space/48577136889jnws2.pdfIn PDF document text
    • http://segwaywheelchair.ru/rofizezavubkf644.pdfIn PDF document text
    • http://dwatches.site/boxotadx9aq.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/wepotavufurewavoduvefile.pdfIn PDF document text
    • http://frankiearvelo.com/gumetosaluz6y6jq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gufopexolax.myartsonline.com/aristotle_tragedy.pdfIn PDF document text
    • http://zarenubopopo.epizy.com/mi_store_app_free.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/bastien_piano_basics_primer_a.pdfIn PDF document text
    • http://pesuvomekujidi.rf.gd/bedingte_wahrscheinlichkeit_bayessche_formel.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_off00025a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25A82 5228 bytes
SHA-256: 6ef798ff50743143483739993460e5baa8938b5f2e35fc8a22a7c708c5f5963c
font_01_sfnt_off00026c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C59 11696 bytes
SHA-256: e34b1d55bae29ce4c379f89c5dc107b116bc4cd8ac31ed46fa61989cb08c864e

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