Malicious PDF — malware analysis report

Static analysis result for SHA-256 16969fb9267366f1…

MALICIOUS

PDF

71.6 KB Created: 2021-02-23 23:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8c93812e84c1ca198629c5abb55256fb SHA-1: 9a239f6689c1d4902ebd5fca960e64592edc8525 SHA-256: 16969fb9267366f152a7262d9a5e4f9e94afc37adf5a3afcc3b6a7161f5233f7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. The primary URL points to a page that appears to be related to 'immunity and disease worksheet answer key', suggesting a lure to attract users searching for educational materials. No scripts were extracted, but the PDF structure and link farm behavior are indicative of SEO manipulation or a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=immunity+and+disease+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500679/normal_5fe7a267082ba.pdfIn PDF document text
    • https://cdn.sqhk.co/vemikozoj/Tktclkm/microsoft_bookings_app_api.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5fdc2618c305f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5fdac818c80e8.pdfIn PDF document text
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/bewegenedunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5fd1d6fc8eb68.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/iihi9hf/zimsec_a_level_history_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/idhepij/flipgrid_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_6018ca74465ca.pdfIn PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/7897180.pdfIn PDF document text
    • https://jasujoru.weebly.com/uploads/1/3/1/4/131483343/jajonanepezot_damapujiv_tavedatigiv_ronije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_60354ac55883d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_6019beb215b8a.pdfIn PDF document text
    • https://zevuvizaxetu.weebly.com/uploads/1/3/4/8/134887967/pidunobarenozap_nikipojakuzuru_danesizat_xirerugumevi.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/KCQgirK/50594158028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupudajiwozov.epizy.com/new_year_photo_card_template_free.pdfIn PDF document text
    • http://zatupux.rf.gd/home_alone_2_full_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/baby_g_ba_110bc_manual.pdfIn PDF document text
    • http://gatutob.rf.gd/halloween_worksheets_for_high_school_students.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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 5228 bytes
SHA-256: 5c75f1daa2504bcdb65aae3aa29c70ee566c96316bd3b0732179eeddd0ee97ed
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 10300 bytes
SHA-256: 5918d4bb78d39d186b247f63d6a99f807f934ff385cd66d21d21729a91672cd0

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