Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57d04ab4b1bd49f…

MALICIOUS

PDF

62.6 KB Created: 2021-02-03 10:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: c9ea36fadeb59cbf8993eb6ff20d1d66 SHA-1: a117bcfbcd964423e92b4db8668a5df10b2e2691 SHA-256: b57d04ab4b1bd49f257a4b1b3294d0ca9f1283506e97bbf2d14013a5736ff7bd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous external links, many of which point to other PDFs, indicating a link farm designed for SEO manipulation. The primary URL, https://druttle.ru/wb?keyword=series%2099%20study%20guide, appears to be an SEO redirector. The embedded JavaScript and the overall structure suggest the document is intended to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://druttle.ru/wb?keyword=series%2099%20study%20guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460680/normal_5fcda961f0c9c.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/eibjecz/lowe_s_stock_today.pdfIn PDF document text
    • http://nuzopofe.iblogger.org/87232182766.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/cO2Echi/78668415797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485166/normal_5ff40280a6dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_6013136e48c7b.pdfIn PDF document text
    • http://uchebnoe.website/classical_mechanics_taylor_chapter_7cfcay.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/jftCJfP/food_high_in_calcium_and_vitamin_d_list.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/jiwedijiwima_demigonuzegiviw_zomop.pdfIn PDF document text
    • https://cdn.sqhk.co/soxemudu/hhij4VN/good_2_player_games_ipad_free.pdfIn PDF document text
    • https://fumujalepobuxav.weebly.com/uploads/1/3/0/8/130813876/pirefudemuzigazo.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/ggqijSB/93696918883.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/ghcfAQI/facebook_stock_news_after_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/jeghcie/war_robots_mod_apk_unlimited_gold_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/duromivap/f29kfAV/best_dark_weapon_dark_souls_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96E 5112 bytes
SHA-256: 547073971fad4bc32bab3874cd9dd4871d3df6e10334945553aa5261be169a1d
font_01_sfnt_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 10224 bytes
SHA-256: cdb015084c20b1b7f0bfa870c75e52e0ec2a5f582b32965d9fba94fb62973e97

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