Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb226316a111999…

MALICIOUS

PDF

128.2 KB Created: 2021-02-24 17:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 20db2cc2a97363900083ac168c101739 SHA-1: 888641d5148029f963fa2ae65ea179767fb6e921 SHA-256: deb226316a111999e2a0a444cec49dc7ad2224eba320275005b606a231643516
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it is part of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=how+to+set+up+a+repeater+in+dd-wrt PDF link annotation
    • http://bewewafip.scienceontheweb.net/pdf_el_juego_de_la_vida_y_como_jugarlo.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/g4lja9S/huey_lewis_back_to_the_future_audition.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/chgjf8O/vegorosewo.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/mojufibem.pdfIn PDF document text
    • https://cdn.sqhk.co/virixerusupa/iejE2hf/xizobexijal.pdfIn PDF document text
    • https://cdn.sqhk.co/gobopovupav/chiiejj/cnc_vmc_programming_institute_in_delhi.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/vicLH73/never_have_i_ever_questions_for_friends_quiz.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/vuxegutupal.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/5_languages_of_love_gary_chapman_test.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/uhkhchd/midobore.pdfIn PDF document text
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/2586144.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/gakufuzojitililokimeni.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/jjjhhgg/56595307423.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/Lm4Cije/vapagewidawitepubul.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/x1_dvr_box_dimensions.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/pazado_zumelepimivik_gaxez_nobubusaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dinigugaxej/52229896671.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/wobexudodupinozu.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/bottom_bed_sheet_in_spanish.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001ab91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AB91 30872 bytes
SHA-256: 7a4341cb72d148450734d05db8df5a84348bd761164a981a8192d96c81c740f0
font_00_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 26952 bytes
SHA-256: e279f31db07d460f0d668f3ca96d3424e0be60362b44b1f607d95272f45ff6ad
font_01_sfnt_off00017582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17582 4888 bytes
SHA-256: 7ffca3e89b0643f1f7b963120a0731b6696a32f1e19699feb50662c5df82f553
font_02_sfnt_off00018640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18640 10884 bytes
SHA-256: bd3e74b1f7cf5b34ce76a7b92f6a29f63531e7f0a578e8ad355079042e3e3a71
font_04_sfnt_off0001e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E220 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176