Malicious PDF — malware analysis report

Static analysis result for SHA-256 d770bd45b19301df…

MALICIOUS

PDF

83.6 KB Created: 2021-06-13 18:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 11ebdb1045a33b35be79626f95eedd03 SHA-1: 6a66e2bd7dfd0e786049dc66b116353a8d8a4d6e SHA-256: d770bd45b19301df455336a037116178f3552ee8e10d395ae1a43091f13465d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'infrive.ru', which is likely a phishing or malware distribution site, disguised with a search term related to a game download. The PDF structure and embedded link farm heuristics further support a malicious intent, likely to redirect users to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://infrive.ru/pbw?utm_term=five+nights+at+freddy%2527s+6+free+download+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458390/normal_606df0cd9c84d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5fc5b33a75e60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_60116f0386d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_600a0fdc60c1f.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://uploads.strikinglycdn.com/files/a9e3e0c4-e082-4e02-9f8e-326927fe3764/galedelogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b4476a-b020-4e02-b690-4681ea7e4b52/vumemafuzuk.pdfIn PDF document text
    • http://nowefuro.pbworks.com/f/how_to_change_keurig_k50_water_filter.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/what_is_the_latest_android_version_for_galaxy_tab_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7ca93a-e1f4-47e8-a9c3-f8adad8df549/4572427846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfb978b-af67-4c09-bb61-111d23459628/ford_expedition_2021_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad072e07-4662-434a-92a6-2f5e1ecd2b9b/bebewubaberamewikitev.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/f/69450537452.pdfIn PDF document text
    • http://suxogovexig.pbworks.com/w/file/fetch/144895791/unipdf_serial_key.pdfIn PDF document text
    • http://fijovolumi.pbworks.com/f/swamp_attack_cheat_engine.pdfIn PDF document text
    • http://varetawepadi.pbworks.com/f/70595007400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e58aa37-f5d2-4623-91e6-eb3e5dfda967/premier_protein_shakes_chocolate_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccea575-ec18-46f5-a5e7-ed2af3e82f77/nebakudiwutelawarubin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81564b24-02c1-4950-b428-703b487f201c/how_to_calculate_weight_according_to_age_and_height.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144536898/scotts_turf_builder_edgeguard_mini_broadcast_spreader_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699d0591-494e-47ff-a81a-571efdfd1578/76196917015.pdfIn PDF document text
    • http://dupalalo.pbworks.com/w/file/fetch/144728412/matokeo_kidato_cha_nne_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6b61db-b9b6-4448-a46e-70ca5d553716/85181692921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9a9f2e-8506-49b6-bd45-ed0298d4cad5/nubixodilazavuwogumibiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdab6713-6ffb-4cfd-8148-f9a4c635de7d/30818878415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/442d5d5b-b482-4fb8-b90f-3291af3d366c/kaxewajirawokatar.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144423894/film_my_stupid_boss_2_lk21.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 5352 bytes
SHA-256: 8e5b8972e36cec1d57ee880b4d1925a08417d9714d054a93300a6c8db8b1548b
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 10536 bytes
SHA-256: 6ef22245f41178c954833e15e223aa0cb0bbd6584c28e1f1b4ed64f75f3711bf
font_02_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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