Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cad4adb4aff552a…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 07:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: eec65653a47e83d01a621c6f1bc126c9 SHA-1: 7abfd92a0fa807510715bffd524809e088c6be6d SHA-256: 1cad4adb4aff552aa262333d706f2bc4869a0ba67b17b6b7cb19c3b9b8761472
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://soxebez.ru/strik?utm_term=element+smart+tv+wireless+connection', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://soxebez.ru/strik?utm_term=element+smart+tv+wireless+connection PDF link annotation
    • http://lebizifijafaxim.medianewsonline.com/gre_quantitative_comparison_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/iiIU2Ea/87059897474.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/ggcHhgX/kodelanelano.pdfIn PDF document text
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/793271.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/qYidI9P/gorillaz_noodle_mask.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/possessivartikel_daf_bungen.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/juzerevi.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/kewim-kipofeletufozu-bixetenevuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatowikuv.rf.gd/fibejol.pdfIn PDF document text
    • http://vexolofifete.atwebpages.com/potorerufenudivozid.pdfIn PDF document text
    • http://savagudalu.rf.gd/53110975787.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/fujexokuxukokaw.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/18200738017.pdfIn PDF document text
    • http://zepuwiz.atwebpages.com/25065644428.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/66297197696.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/amnesty_international_activism_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/74781573133.pdfIn PDF document text
    • http://jigabez.epizy.com/xatoj.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/bounce_game_for_jio_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/iron_and_folic_acid_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/knock_balls_mod_apk_unlimited_money.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/rabinawerelekepafeve.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/77605146190.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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 5056 bytes
SHA-256: f417345c2685d45c7ec549e71c2581ef49761c48224eb5a32a5201ff9280b46e
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 10480 bytes
SHA-256: f828c69503529f42da57e403d2fc9edf8c2e0cfedd53f3600d226cc57fccfee2

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