Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88aef1a76c4b94c…

MALICIOUS

PDF

75.8 KB Created: 2021-02-19 07:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 60b7ea12ed930913f80fb2eaf9627f73 SHA-1: b7cf9cfa6e1555b23c147528207225ec4ada6a08 SHA-256: b88aef1a76c4b94cf460fbf20ac46c69f39f849abfa25ee106d5d9a14ce809a1
254 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded link `https://crophysi.ru/123?utm_term=contabilidad+de+costos+ejemplos+pdf` is likely part of a phishing lure, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=contabilidad+de+costos+ejemplos+pdf In PDF document text
    • http://crispyset.online/soy_el_numero_4l6bvl.pdfIn PDF document text
    • http://ultra0.space/linear_function_formula_meaningrfnwz.pdfIn PDF document text
    • http://blacktea.space/bully_pc_game_trainer_free76dfm.pdfIn PDF document text
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/4d4d7.pdfIn PDF document text
    • http://naturmilans.fun/bad_romance_piano_sheet_musicc2s9w.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/ZhirihH/wakofewamen.pdfIn PDF document text
    • http://artrosil.xyz/serie_after_dark_livro_4jk11m.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/zolerazowubow/pujobomuxarositapitijimed.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/husqvarna_455_rancher_carb_adjustment.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/maths4everyone_single_functions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/guitar_tab_template_word.pdfIn PDF document text
    • http://dowijasimenazo.epizy.com/90431166267.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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 5324 bytes
SHA-256: 86b26dcff703290ba739263f3a7802681ecceae6756bb3fac2c15160b9e377c9
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 11404 bytes
SHA-256: ed3c964d74fc0b6b91e0f898009eaf99103aab29d6ed32adf240017ed23d0174

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