Malicious PDF — malware analysis report

Static analysis result for SHA-256 78055888a6b49830…

MALICIOUS

PDF

68.8 KB Created: 2021-01-10 02:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 06bac5ab707df149326c1d4783c698f3 SHA-1: e549e73b31183fa17ecbf9baf88191b3b2a91bdd SHA-256: 78055888a6b498302d210341beba2401b64372826f8de9f81facd303870204ba
216 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://traffnew.ru/123?utm_term=footloose+the+musical+sheet+music', appears to be a redirector for phishing or malware distribution, disguised as a free download for sheet music. The presence of malformed streams and ML classification further indicate malicious intent, likely for distributing further payloads or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/123?utm_term=footloose+the+musical+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5fc6cb1508946.pdfIn PDF document text
    • https://wejerimaz.weebly.com/uploads/1/3/4/6/134648800/9838665.pdfIn PDF document text
    • https://site-1174607.mozfiles.com/files/1174607/65199912348.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/Jjsibgg/la_dodgers_font_generator.pdfIn PDF document text
    • https://site-1171534.mozfiles.com/files/1171534/jefigopofadu.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/14246052989.pdfIn PDF document text
    • https://gesefamuredoxuk.weebly.com/uploads/1/3/4/6/134631359/dutipugabojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f8bb13ba8dca.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/baposivarabuj/media_information_literacy_curriculum_guide_deped.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/neloxofubodeboza.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/jedigubasopi.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/ravuvojunoruxopajomofakij.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/buell_blast_performance_mods.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_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 4900 bytes
SHA-256: 67e70d7461ce7f1f0c3df7d8cc93b2d04a6bfc5368457885922304141485f543
font_01_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 10344 bytes
SHA-256: 31dfb31777f54ead44c5f627bcfd2a531f11f98a73f45559a9fd5af46d8deba2