Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ce2d2f81fef0e6…

MALICIOUS

PDF

76.9 KB Created: 2021-01-14 22:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b1dfed5fb2a59620a9ae27d8a3aa9d2a SHA-1: 8ea832467ec8f92c3eb980c56e1e5d7252724595 SHA-256: 63ce2d2f81fef0e6a260f4b67e7997ceb619e5364cbf99f26dd51658d332a6e7
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, some pointing to disposable hosting and employing UTM parameters, suggests a phishing or malware distribution campaign. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern, aiming to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=atul+maheshwari+admit+card++2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5ff1523136c7d.pdfIn PDF document text
    • https://site-1167951.mozfiles.com/files/1167951/30077805157.pdfIn PDF document text
    • https://site-1173528.mozfiles.com/files/1173528/wofatusagodazexiwa.pdfIn PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/49528280366.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5fdd3e8e67872.pdfIn PDF document text
    • https://site-1176357.mozfiles.com/files/1176357/download_hyperburner_apk.pdfIn PDF document text
    • https://site-1167986.mozfiles.com/files/1167986/rules_of_survival_mod_apk_diamond.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f885b2941239.pdfIn PDF document text
    • https://site-1171534.mozfiles.com/files/1171534/best_animated_movie_quiz_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_5fbfd36e125ce.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/fcja2ia/penguin_run_2_game_download.pdfIn PDF document text
    • https://site-1176154.mozfiles.com/files/1176154/healthy_eating_tips_for_kids.pdfIn PDF document text
    • https://cdn.sqhk.co/wedifedaguju/iiBjbgd/new_year_fireworks_sound_effects_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5fdafef0dc56b.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001117a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1117A 5848 bytes
SHA-256: 6729881862fc6d0800937976f764a134da8415b1c7689dc1eea70007d89d8cbf
font_00_sfnt_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 5780 bytes
SHA-256: f71f9112b6d903940e91a3cdb312303f8d274bc31655e930e207586a3242acfb
font_01_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 10232 bytes
SHA-256: ac9ab9adcc396a1ec28c8156141440dd7d3a62964606816baace4b62499dd44e

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