Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ef78f86b9bedb2…

MALICIOUS

PDF

82.8 KB Created: 2021-05-28 21:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4b8394dbc548e859b8765b426e703525 SHA-1: 26e794efea37d9994a52e4168009404e028d8c72 SHA-256: 19ef78f86b9bedb2d5865f99f12ab328ac2918d723cedbea0cba67c4da45d121
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which are hosted on disposable platforms like Weebly. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/123?utm_term=toyota+camry+2012+review+consumer+reports PDF link annotation
    • https://xuzelakojit.weebly.com/uploads/1/3/4/5/134593048/3294f38e89.pdfIn PDF document text
    • https://ferafavobob.weebly.com/uploads/1/3/4/6/134671558/4ff7d.pdfIn PDF document text
    • https://waxizeno.weebly.com/uploads/1/3/0/8/130814339/sabowuj.pdfIn PDF document text
    • https://dexeputurad.weebly.com/uploads/1/3/4/8/134878817/fae90bad618fe74.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/joxiporomesorutu.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/gizajorusuxuze_taxolafamoxat_tovepenetagifib_gufakavifo.pdfIn PDF document text
    • https://kisogegexene.weebly.com/uploads/1/3/4/3/134374262/4046459.pdfIn PDF document text
    • https://fejegexe.weebly.com/uploads/1/3/4/6/134617501/purew.pdfIn PDF document text
    • https://fiviwadixuxenel.weebly.com/uploads/1/3/4/8/134854304/41359d149104.pdfIn PDF document text
    • https://zodukoweferu.weebly.com/uploads/1/3/1/0/131069906/d8bee1.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/ab8ea4cc-fe72-469e-85ee-c3d74daa0976/kuxovibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5598be1-57c7-483f-ad7a-0fe3839d5fef/81170373986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b4fc78-ea77-4b24-b1d9-01b12f66e2c5/fiwejadodojigiluku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63eb07e-edc4-4ec9-ac2b-2e69a7c9a7f7/sword_art_online_game_fatal_bullet_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a3f136-6658-4ee5-ad7e-cf6bb860e92b/nobutuzeriboleta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0927cb5-ea11-4e37-9810-13f1b5babdca/roku_streaming_stick_plus_best_buy_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9046642-dc7b-45c5-8af1-5768d8e0a8cc/40470448860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/addc6d21-4939-49e0-a128-c6222d867b77/where_do_latin_words_come_from.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03014182-265f-46bd-b229-7a2b64536474/aumentos_y_disminuciones_porcentuales_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edd8fbf-c60c-400c-9d39-3e1077a77d18/la_republica_de_platon_libro_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4695bdbb-73e4-46ec-8ff5-8469a23e6cd3/35813172882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d268e70-942c-48fa-ac35-d5a2d8b66ac2/how_to_analyse_survey_data_in_stata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f324c5f2-11c0-4528-8fe8-d0947c087433/71056748286.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_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 5576 bytes
SHA-256: c14f5db01597c7e2841f491f40a174e660a95add261825dd625640d1bb3de47d
font_01_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 10576 bytes
SHA-256: 57f09f9103b88251d65b626bd63593d540a23b0f3b3a8e969cba7a358fc6f9a1

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