Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7709d24b8ea5042…

MALICIOUS

PDF

86.5 KB Created: 2021-03-11 22:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c5634db87f3f34d1a7c0f79b82f94a8b SHA-1: c7b03c2588d34a1b4deea8816b2ba154c5071755 SHA-256: b7709d24b8ea5042e94434de57da38f3c959123a1ee820414fd69f8f374963b5
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=pond+ecosystem+gizmo+quiz+answers PDF link annotation
    • https://zamokofoviwikaz.weebly.com/uploads/1/3/0/8/130815095/4939466.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/55b3ddd16d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_60256d6422a21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449783/normal_5ffd1b869183c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_604475d8d88fb.pdfIn PDF document text
    • http://woviregawafokal.22web.org/how_many_boesemani_rainbow_fish.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/kikurokusanoxix.pdfIn PDF document text
    • https://lexojonogi.weebly.com/uploads/1/3/4/3/134315697/7713954.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/anthem_blue_cross_medicaid_appeal_form.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/juzajumifevevovu.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/is_daves_bread_keto.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/7353f2ed.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/iphone_camera_scanner.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/7539ab36-f4e7-4b1a-9d17-5f379abc7880/maze_runner_2_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81252448-d5d1-4202-8fff-3da028c0d32c/russian_special_forces_hand_to_hand_combat_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8495c15-b788-4365-bd6d-0fd6991238c4/canon_speedlite_430ex_ii_price_in_bangladesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e200e91b-3901-48b8-ba52-1e2e77b383be/33960783709.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/anari_movie_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/fokikezapuramuzafoveguwej.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/sheet_metal_l_g.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/criminal_case_unlimited_energy_hack_apk.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/3296764410.pdfIn PDF document text
    • http://vekejuf.atwebpages.com/74662902960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d5ce21-f10c-4f7b-b1ce-357a1a9a8c95/dalopepax.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/82213478616.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_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 5596 bytes
SHA-256: c5772697521cf7f417e1ab5039a3650da96a355a820cd1a43a4451ae2c3fa8ee
font_01_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 10528 bytes
SHA-256: 8a47c72929ec7d6f7d81699e1a58fb00bc254b33a936b11346335223ab2ce620