Malicious PDF — malware analysis report

Static analysis result for SHA-256 573a4c1cdda4bbc0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 01:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9fdbc6b037d73e946c7f1a10d7595b2d SHA-1: 2165bb5370bf068a6c359d87d8d68dbb1c79bc37 SHA-256: 573a4c1cdda4bbc0a5ee4af7aac6b3ce8ad878ed41a42334165e16769cd657de
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URIs pointing to other PDF documents. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the nature of the link farm suggests it is used to redirect users to potentially malicious content or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/wix?keyword=brine+shrimp+lab PDF link annotation
    • https://cdn.sqhk.co/dukoredod/gjk46uG/91903988782.pdfIn PDF document text
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/gupokuledavazo_tawuvomibigogix.pdfIn PDF document text
    • https://felilediwifagid.weebly.com/uploads/1/3/1/4/131453780/tixadilovatubij.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/junibe-melofijig-vutov.pdfIn PDF document text
    • http://sallehub.xyz/titulos_de_creditow58af.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/hiehogj/revolico_motos_suzuki_ax_100.pdfIn PDF document text
    • https://cdn.sqhk.co/gizetinediz/bjgH7fL/99117694655.pdfIn PDF document text
    • http://parkingtest.xyz/decimal_to_binary_conversion_exercises_with_answers4z5g9.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/d0bfab30cb.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/OHhbhiw/equalizer_app_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/mDthajj/crash_dive_pc_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/9gdjb2c/25141219231.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/hg1ifMz/9398598868.pdfIn PDF document text
    • https://cdn.sqhk.co/tefebenum/cvhcgjH/alabama_state_income_tax_forms_and_instructions.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/30661842566.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/tiniruru/nukidabapipetafimalananu.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/93706176877.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/allow_multiple_s_chrome_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/formal_dress_boutiques_in_baton_rouge.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/67438748186.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/adobe_premiere_pro_cc.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_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 5248 bytes
SHA-256: ef2127b207ea219b85b37f7f427224930f25edc7f78c337d50542ece7b82dd1d
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10804 bytes
SHA-256: 77f92e325c05b9fe196865590f43274235349068cf7ce4325af8cc49afc99a1d

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