Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b2766ed8053a4f…

MALICIOUS

PDF

87.6 KB Created: 2021-02-18 00:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8c4624dceb9bce5eea943102ebe196af SHA-1: 9f79ea37629adb58c89f5b2bb3069dcf1c13e075 SHA-256: 94b2766ed8053a4f1268ef5a69bd403b88c935a518713388eb644dc7fcd912dc
194 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to "Big little lies season 2 episodes list". The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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://yafferge.ru/123?utm_term=big+little+lies+season+2+episodes+list In PDF document text
    • https://cdn.sqhk.co/suxepemup/jifHHqp/detox_for_belly_fat_loss.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/fMgcwje/snake_clans_fun_addicting_worm._io_snake_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5fd85ba88e755.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/1lTVshd/vawetujala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_601c025f2f706.pdfIn PDF document text
    • https://cdn.sqhk.co/vanatuwo/NJNijbq/wordq_online_multiplayer_word_games.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/g6khd9C/duck_life_treasure_hunt_poki.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/ihgihda/earn_free_recharge_by_downloading_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/ig7ebp8/tawev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fcd6498da5c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471960/normal_5fd2589e36d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fe77800e07b9.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/hegjjaR/logo_quiz_level_253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_600f343598f4e.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/gekHnTp/zekoreso.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/medaliwifufugel/10988522354.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/sijajotatulami.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/noribalavug.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/bademudim.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/kumokabimi.pdfIn PDF document text
    • http://mawunodopijosa.epizy.com/mortal_instruments_characters_hogwarts_houses.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/xafovugafasedidujepanig.pdfIn PDF document text
    • http://zukavinu.rf.gd/bagivaropug.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 5212 bytes
SHA-256: e43ef855b80ca3bd6bfbca5dad60f948f6a2976013430f6706abc58283b2246c
font_01_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 11256 bytes
SHA-256: fab000e1a1e39d6f01512e372e62f0d19b27b9f6cc182c1c0ec4865313caffaf
font_02_sfnt_off00013b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B62 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f