Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b44436d5009267…

MALICIOUS

PDF

86.0 KB Created: 2021-03-15 17:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0e8a4d569fb6cd0e5a38dac6a258f3ba SHA-1: c485e7321f1f21afac60a448a4242a783ecbdd21 SHA-256: 17b44436d5009267a81d39fe900038a842da7aea543d2486073c0c1a39853d4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/aws?utm_term=best+end+of+the+world+movies+imdb PDF link annotation
    • http://barajofa.mywebcommunity.org/what_is_an_example_of_a_persuasive_essay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_601886719f280.pdfIn PDF document text
    • http://blockhcain.host/hidden_bonfire_stories_faceless_gravedigger_collector_s_editionm7pcg.pdfIn PDF document text
    • http://firstdoctor.xyz/destination_imagination_instant_challenges_iowavai1s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_602d4c3f6c3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_604670065e8a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fc8521de093b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485930/normal_5fe534dca5965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_60226e85ba1c0.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/remedial_mathematical_biology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497395/normal_60086ad48838c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416659/normal_600272f46df53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_603fdae025116.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/fireravega.pdfIn PDF document text
    • http://blancop.xyz/why_wont_my_space_heater_stay_on1c9kx.pdfIn PDF document text
    • http://kibesamifi.getenjoyment.net/uniquely_human_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_604e220350568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fd6854addaba.pdfIn PDF document text
    • http://luminar2-download.xyz/what_colours_can_tieflings_be3whu3.pdfIn PDF document text
    • http://opt15.ru/22823074130et5x.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
    • http://vexolofifete.atwebpages.com/novumigorazapira.pdfIn PDF document text
    • http://laxuzoto.onlinewebshop.net/bemegagagusiriso.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/how_to_make_a_flavored_simple_syrup.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/serta_icomfort_serta_motion_perfect_iii_adjustable_base_king.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/beata_pawlikowska_ksiki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 5068 bytes
SHA-256: 1e3b27f72549a06caeb91fc943a7ee381e2ccbee9c6f611e883bb6aec328a344
font_01_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 11080 bytes
SHA-256: a25207f8c3e063c1998ef985696aa0d4c7ab79673cf28199ca0a05fe103ee7d5
font_02_sfnt_off00013bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e