Malicious PDF — malware analysis report

Static analysis result for SHA-256 df74c28fdcad42c6…

MALICIOUS

PDF

74.2 KB Created: 2020-11-25 00:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a5032853e6bec3977f5981d350c7c7d1 SHA-1: 336087945b7a3eba7ab3091edf4fb30ae022c225 SHA-256: df74c28fdcad42c6473ac7334dd63358f19ce6af7854cea03cdb9e05626bdfe1
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with SEO-based phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for credentials or deliver further malware. The primary IOC is the redirector URL used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ggtraff.ru/123?utm_term=immunology+book+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5fab799fbb69f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_5fada6248bc10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f8ab3430e454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_5faaeea0d789f.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/6053ee41-a2c0-4abd-b4d3-6f97d4892107/jugegizevidodaveketuvufig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7ad31d-d4ad-4db7-8eb6-be29797c50da/53457214856.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/6692959546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c404ba43-c369-4805-9399-2878f919f0df/wododoxabaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187d8a15-c0f6-4470-8a14-1f073c58024e/tae_kims_guide_to_japanese_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57dacba6-fa81-4fc6-92c2-39564c055b5c/1111_meaning_ta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13800c2c-2949-47ee-84a1-c4eff7cf7de9/621728488.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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 5520 bytes
SHA-256: 0b32375285a0f75028a733be3ab29af09ff34a91aad049ba677f548fa4201111
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 10820 bytes
SHA-256: 3b220c60638081a6d57013920506287bdf73b64725cb5286e8843b70ac8d9d8f

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