Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bf356af1c4ec3e…

MALICIOUS

PDF

71.8 KB Created: 2021-03-23 13:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 60f0ae051b4252708b45eae9017e0ca3 SHA-1: 7ea022f9a145b0b9ded0a401b7c299771f63953d SHA-256: a8bf356af1c4ec3e1b815f8edd002e080da0b9cdd1bf0a15a8d014f0552e1b89
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the extensive link farm designed to redirect users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=karl+marx+worksheet In PDF document text
    • http://jiteruruw.sportsontheweb.net/10690371977.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/8f93e5e7fddf75.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/power_wheels_dune_racer_battery_charge_time.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/9665531.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/kuves.pdfIn PDF document text
    • https://xukobali.weebly.com/uploads/1/3/4/8/134882082/lusim.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/job_interview_questions_and_answers_uk.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/4113352.pdfIn PDF document text
    • http://pamatidela.getenjoyment.net/more_than_pet_insurance_claim_form.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/jowitesurabojanil.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/20040869826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/45446537460.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/bob_revolution_double_jogging_stroller.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/cissp_sybex_7th_edition.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_f17b83183386426a93b08df285c300e9.pdf?index=trueIn PDF document text
    • http://tipokeviti.atwebpages.com/poxuxon.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/rinnai_rur98ip_installation_manual.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_c0e4c4d14bdb4916b8695107f7d30761.pdf?index=trueIn PDF document text
    • http://titugol.atwebpages.com/mojak.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/que_dia_se_festeja_hoy_en_estados_unidos.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/71289967359.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_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 5116 bytes
SHA-256: a62090e8a9064a9dca9ea7b0eee2fd7b910f3528ba954806b5fa376a6aab7472
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 10628 bytes
SHA-256: 01cdd46041867f5f4bf6a37f8a3c78b517e97dbd0d1c6a7175ba2b080e45743c

Open this report in the interactive analyzer, or submit your own file for analysis.