Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53cbfef902763b3…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 09:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e2194b9e08d852c9164305a47c064025 SHA-1: bc939846ca19409d4e2bc7b85b7edd119358105e SHA-256: a53cbfef902763b309c85d2e217b12b8ba54394015822837f611f053024d3aa2
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 flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=1999+kawasaki+prairie+400+tire+size PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408706/normal_6018682899610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470028/normal_5fcc5a3c6c968.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/db551d72dfd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473410/normal_5fdf387c61a70.pdfIn PDF document text
    • http://tupakewufitid.iblogger.org/varifejeteveduzodovodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_603455dade426.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/lire_journaux_algriens_en.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/historia_de_la_iglesia_cristiana_jesse_lyman_hurlbut.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/juditigolorov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xologikaju.atwebpages.com/amoeba_sisters_video_recap_bacteria_answer_key.pdfIn PDF document text
    • http://povoxuzewezida.epizy.com/99966566389.pdfIn PDF document text
    • http://nixedorufimidax.rf.gd/cdigo_penal_de_puerto_rico_1974.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/blue_moon_of_kentucky_chords_paul_mccartney.pdfIn PDF document text
    • http://xevikosurozogin.rf.gd/afcat_2_2018_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/bulk_insert_format_file_double_quotes.pdfIn PDF document text
    • http://giniwovobodomu.epizy.com/casa_buddenbrook_download.pdfIn PDF document text
    • http://gamupuzif.epizy.com/81449717686.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/bopizunazevojitozoxetef.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/juxitagijazu.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/jagipixujixapuzanux.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5332 bytes
SHA-256: d7fb324aec15e0fec011039ff00fb87da9b1222564757804a6c91ab14aa714ac
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 11576 bytes
SHA-256: 1ad7759fcceef564d2c8ad823e7764a72f97ddf45933cdae9a71fc7b8ee43eb0

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