Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cb61a6cb22ca3e…

MALICIOUS

PDF

75.1 KB Created: 2021-03-27 19:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b24b37c883bdc47b8dc93ca6d175f30c SHA-1: 58f73178f30de85f2b3ef097b1b11c6d952c9659 SHA-256: 80cb61a6cb22ca3e8573ee1caa49e70a8dcbf0f54ac25a5e19b3af4a0ab2c97a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF documents, which is characteristic of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the embedded URLs suggest a potential pathway for users to be directed to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jottigo.ru/123?utm_term=up+b.+ed+online+application+form+2019 PDF link annotation
    • https://cdn.sqhk.co/nogorodizet/FIOjgjd/freeway_rick_ross_net_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/vghghgg/pekodemuw.pdfIn PDF document text
    • https://cdn.sqhk.co/rogokivika/bjbmgem/18886528778.pdfIn PDF document text
    • https://sunupukub.weebly.com/uploads/1/3/5/3/135319403/nipofe.pdfIn PDF document text
    • https://masizomomom.weebly.com/uploads/1/3/2/6/132681315/lerurebelomixituzuk.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/modalor.pdfIn PDF document text
    • https://ronudinogem.weebly.com/uploads/1/3/1/3/131398573/rakek.pdfIn PDF document text
    • https://nazorokofewedu.weebly.com/uploads/1/3/2/7/132710677/tijizinijirepa.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/djeM1id/9674595577.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/bagubirevepigamupe.pdfIn PDF document text
    • https://cdn.sqhk.co/javufikari/jiHmXje/hello_kitty_fun_carnival_party.pdfIn PDF document text
    • https://dotolisode.weebly.com/uploads/1/3/4/6/134616401/955f556a95.pdfIn PDF document text
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/litofetopovu-kezuzi-najisi.pdfIn PDF document text
    • https://jadimakadafi.weebly.com/uploads/1/3/4/3/134378671/kinoroxog.pdfIn PDF document text
    • https://pebitazoma.weebly.com/uploads/1/3/4/8/134849778/jepejereba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabejaje.epizy.com/maytag_bravos_x_washer_wont_spin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11df6d4-640c-4b6d-84ef-3ee7a894a283/jodimixizodawesutodo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/93157079797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7819d837-b355-4640-bfe6-8f232262d0a9/pidazitesisawerololupozup.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/premier_protein_cinnamon_roll_recipe.pdfIn PDF document text
    • http://pebafuduzuxifa.rf.gd/how_much_do_international_consultants_make.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/nemikusojikazer.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/strongman_training_program.pdfIn PDF document text
    • http://jakowufa.epizy.com/vodivesokixowaxafeguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386adfff-82ee-40ab-8b7c-ccee52b366a6/60936507029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a46566-4546-4db0-afa1-f03d9b9a25a7/jukinejegudopimororaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba91c4b4-ffa0-4af3-a9e0-a4ef22826968/80428647064.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/gigutudatiwura.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_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 5768 bytes
SHA-256: 68ff5db66786a486025e58c9e5d803ec5d660fab92edf711113d89bbfcfcf10b
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 10788 bytes
SHA-256: 2792d60fa0209da43802ef2c14dffaaa168fd1a8fe9e0b6ef18d230c12475798

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