Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6329f5567e122c8…

MALICIOUS

PDF

103.0 KB Created: 2021-03-27 14:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 44979ea467a435ed0ee663ec45a32d43 SHA-1: 599bbd815c79c20311403d0d1ebc166a16d59c06 SHA-256: b6329f5567e122c807bbe521f4ddae3ef301230e9aa288830ef4e8992691963f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, pointing towards an attempt to redirect users to malicious sites like https://maypoin.ru/strik?utm_term=hbs+910+digikala.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=hbs+910+digikala PDF link annotation
    • https://cdn.sqhk.co/kuzetuzame/chdjquv/wozijituxi.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/behaviorisme_pavlov.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/3934062.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/lanamijabere.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/nebadoli_favisedesejuba.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/hfgjjhg/schema_electrique_simple_allumage.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/git_branching_strategy.pdfIn PDF document text
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/6107321.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/ji3jihd/87813342396.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/lexuxozebijipa_virutugo.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/ielts_answer_sheet_reading_and_listening.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/jgrjgii/lixupatebitixekebobo.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/9da27fcb-1a5a-4c83-aba8-dee1a2fccd19/how_to_fix_home_ac_unit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a26ccd3-b60d-4863-a962-57b565723db6/how_long_does_it_take_to_recover_from_a_ptsd_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/basic_electronics_vk_mehta.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/baml_equity_research_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e280b7-82b3-4739-a3d4-e94b19d56aef/how_to_activate_my_nordictrack_treadmill_without_ifit.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/64074192262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce40bff1-6a60-445e-8661-481f2ece4653/vadozatudukozekodekit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42f5fca-67b4-4cdf-97a7-f050fa1c1684/how_much_do_construction_cleaners_charge.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/english_arabic_picture_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/81013304693.pdfIn PDF document text
    • http://pawuzax.onlinewebshop.net/malowesukuserel.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/35556348236.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000156fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x156FB 30296 bytes
SHA-256: fbb88ac86db7cd6544f0ec0fac87a3860761fd6a185a37b19899e97eab135e37
font_00_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 5412 bytes
SHA-256: fde7c671b5be925c17ba26ac24a17c687b4481dc0672b8d7d5db17f8210aaac2
font_01_sfnt_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 10932 bytes
SHA-256: cb196ff291698db65d24bcf89d85a65bedc71c0f94fc3a5d09f0179dd116ead5