Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c6d9a2d0e6db81…

MALICIOUS

PDF

78.5 KB Created: 2021-01-07 20:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 30717bbfb654eb75c684f16bfa5bbe8b SHA-1: e1baa1540ecc580f2ff7c374a2439ccefdc03941 SHA-256: 39c6d9a2d0e6db81604c0812180c04c90de9d0b2610244cf513cde64941a923d
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains multiple links to redirector infrastructure, specifically `https://cctraff.ru/aws?utm_term=facility+maintenance+checklist+pdf`, which is designed to lead users to malicious sites. The presence of numerous external PDF links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. No scripts were extracted, but the document's structure and embedded links strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://cctraff.ru/aws?utm_term=facility+maintenance+checklist+pdf In PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/6128261.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/24b07e.pdfIn PDF document text
    • https://kebapalof.weebly.com/uploads/1/3/4/3/134317433/2986007.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/kerovujabenalebixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8122e1-9588-4bff-b33b-f2fe91d19ac5/20141145554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c1bab8-970c-4bdf-b053-4b3b126627d5/xusifiporofuli.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/2018_camaro_ss_manual_0-_60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2d01f6-deec-42c6-859e-027cceefe066/pokemon_level_up_sound_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/debt_snowball_spreadsheet_dave_ramsey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e11e714-2cd4-49b1-a8ef-57ea7c22c103/real_free_amazon_gift_card_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/shell_script_tutorial_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5007ad21-b5e8-4c48-86a5-503b3145f372/fibilefap.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 2

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 2960 bytes
SHA-256: 4fd23780e8bc1225147496f7cf1539e4cbb7afbb69deb1762206f21ee21730a8
font_01_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 5420 bytes
SHA-256: 8180332253d283e4fe895f6809d8e28cd478e92af462f3938c8a72d382a1e640
font_02_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 10328 bytes
SHA-256: 652d163ebb660d49ff67904e16501145589c2e05a2df1686b7dcbe3b6ddae756

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