Malicious PDF — malware analysis report

Static analysis result for SHA-256 5355f08af0a7f253…

MALICIOUS

PDF

78.6 KB Created: 2021-03-03 09:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: fb97731654cbc1d9ca6cca4c4e467c01 SHA-1: b31f64f34de61e4fb7e9e85d31a8e66ed92ba6fe SHA-256: 5355f08af0a7f253da51f6694fe7580db05b8859503e927a9cc5bcb99fe54f56
184 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, appears to be a lure related to a product search. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=900+watt+microwave+good In PDF document text
    • http://hempmap.ru/cadenas_de_markov_ejercicios_resueltosfowpw.pdfIn PDF document text
    • http://legovimoz.iblogger.org/29351946040.pdfIn PDF document text
    • http://verifedform.com/devil_s_peak_rally_mod_apk356sb.pdfIn PDF document text
    • https://popuvagilubasi.weebly.com/uploads/1/3/4/0/134018524/pikutexawalaxutuka.pdfIn PDF document text
    • https://bipewajebij.weebly.com/uploads/1/3/2/7/132740639/11e6ed.pdfIn PDF document text
    • http://arm-watch3.club/vonewomuxusajoludabakaqfjp1.pdfIn PDF document text
    • http://reflectionss.space/american_red_cross_cpr_online_test_answers856pk.pdfIn PDF document text
    • http://padlamadla.site/54463646380fjp3b.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/panokojol/38761942301.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/lozirifesavuwonagu.pdfIn PDF document text
    • http://sefozutobikawu.epizy.com/11891992421.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/how_to_set_a_g-shock_casio_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/miwef.pdfIn PDF document text
    • http://jofikajanuxepu.epizy.com/pazok.pdfIn PDF document text
    • http://junamatodomuwip.rf.gd/60124891595.pdfIn PDF document text
    • http://batuzotunar.rf.gd/business_card_template_for_real_estate.pdfIn PDF document text
    • http://sejedusodumevu.epizy.com/the_unbearable_lightness_of_being_book_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/google_chrome_myanmar_font_for_android.pdfIn PDF document text
    • http://zikofizoredu.rf.gd/peramomutijijepogapi.pdfIn PDF document text
    • http://livofos.epizy.com/let_it_go_song_piano_sheet_music.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_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 5404 bytes
SHA-256: ab1726f288fecf550b671d4d36ddb04049e7eed61c5747632abeb8f2055d0538
font_01_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 10852 bytes
SHA-256: 2ef9992ab08d0e935a8beba373dbc31543c3ff3fab8a5c8ae9b82635a0b56752

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