Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1aa8ac21f330657…

MALICIOUS

PDF

74.7 KB Created: 2021-03-19 21:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4680b277695605c104eb7d7c97e6abfd SHA-1: 56f631b5fae3bf564ad7696bdab91984ae71c841 SHA-256: b1aa8ac21f33065764b3dd32d704e03bf7d07cd4fc0262fa2dc8bedf73e7dbec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and numerous external links point towards a malicious document, likely intended as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/award?keyword=tom+m+apostol+calculus+volume+1+pdf PDF link annotation
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/5799171.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/bgimVjf/62697942064.pdfIn PDF document text
    • http://letuxegesilem.iblogger.org/share_sale_agreement_template_australia.pdfIn PDF document text
    • https://bisenazogogo.weebly.com/uploads/1/3/4/6/134686343/29e077d5f89ee.pdfIn PDF document text
    • http://luduloze.iblogger.org/what_does_stairway_to_heaven_mean.pdfIn PDF document text
    • https://sapefesoj.weebly.com/uploads/1/3/1/4/131453354/sazikewurupuvogudok.pdfIn PDF document text
    • https://cdn.sqhk.co/wemulekojex/kpfea5m/46570661077.pdfIn PDF document text
    • https://kodopexo.weebly.com/uploads/1/3/4/6/134693050/wegepizupikajad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jalofepo.rf.gd/givepijatesakogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4383bbb7-670a-46d4-a4ef-4c23ebe5bc79/fiwadosazudetapinezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6529c61f-4428-4d76-a3ac-5db4cf7beb75/14061175854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe0df3e-a057-4ea9-a7e5-4e3ba6dbb34a/47864748279.pdfIn PDF document text
    • http://mibesajaku.epizy.com/absorb_information_senses.pdfIn PDF document text
    • http://bowelabu.rf.gd/34917474528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054c59ea-210e-4987-88ec-055287bbd220/how_to_build_big_biceps_without_weights.pdfIn PDF document text
    • http://pifimat.epizy.com/39786730721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a318d1-eaf8-4518-80af-acfac85c33b5/how_do_i_turn_on_speakerphone_on_my_panasonic_cordless_phone.pdfIn PDF document text
    • http://wilobinej.epizy.com/sql_dba_interview_questions.pdfIn PDF document text
    • http://vowaxuf.rf.gd/formato_de_arrendamiento_de_vivienda_urbana.pdfIn PDF document text
    • http://zubikexef.rf.gd/bollywood_movie_hd_video_song_free.pdfIn PDF document text
    • http://lamerowed.rf.gd/17365411358.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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 5268 bytes
SHA-256: 7cfd69a12503c10bd022f734cebcd57e56029bc8a5b22f21e0716dc0dffe2176
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 9972 bytes
SHA-256: 31c056eeda5f1aeec9d9e43ab69ff0ce068a8c79dcb4a54b9d441a855a995459