Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a5b3401a8619c5…

MALICIOUS

PDF

68.7 KB Created: 2021-01-11 08:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 49f57fbaf01e54e09de946b36c835077 SHA-1: 966dc70ca0013d4a9f6608e06e275d47bbb4efd9 SHA-256: 27a5b3401a8619c53f24bd83281463e19bbe508cef7dc6c32c954603b1f928a1
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a high-severity heuristic indicating it's an SEO redirector used for phishing, luring users with a fake download. The primary malicious URL identified is https://trafffe.ru/aws?utm_term=effortless+english+book++pdf. While no scripts were explicitly extracted, the PDF structure and the nature of the redirector suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=effortless+english+book++pdf PDF link annotation
    • https://site-1171628.mozfiles.com/files/1171628/raloxomagilawinuvov.pdfIn PDF document text
    • https://cdn.sqhk.co/gilitejeku/qjc0yor/super_mario_3d_world_switch_release_date_uk.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/people_nearby_telegram.pdfIn PDF document text
    • https://site-1176079.mozfiles.com/files/1176079/zunekepodinot.pdfIn PDF document text
    • https://site-1171686.mozfiles.com/files/1171686/server_2016_remote_desktop_not_working.pdfIn PDF document text
    • https://site-1174961.mozfiles.com/files/1174961/new_tnt_mod_1__15_2.pdfIn PDF document text
    • https://site-1208496.mozfiles.com/files/1208496/70920796958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fa6a5e15e757.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/rubidokezive/82988540032.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/cantico_delle_creature_branduardi.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/math_worksheets_algebra_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/canada_visa_purpose_of_travel_sample_letter.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 5256 bytes
SHA-256: f592c7fb0fbfc808ecd476d70157b7f3b0771f5f7296676f91a62dd884da999c
font_01_sfnt_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 10612 bytes
SHA-256: 66aeedd233e00a07812d3b9fef7fbec5509f52397c59a3434d968a32ba41b4ac

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