Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b9d657c5aa2ccc…

MALICIOUS

PDF

63.2 KB Created: 2020-11-21 12:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5b20c9bd704d12c8d69740a1f2138724 SHA-1: e0c22cd3316a0b0739c7c416a30346694ee2fb2c SHA-256: f4b9d657c5aa2ccc050a96956ea07189128bc27198b0070c3d7c0279fd584f1d
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a malicious redirector. The embedded URLs and the ML classifier strongly suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Siri on android apk', likely a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffmen.ru/123?utm_term=siri+on+android+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5f974cec771c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415527/normal_5fa699c07abd5.pdfIn PDF document text
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/vukugaxiri_dufuremajata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f98c7ec2265f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f9bf274e3b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f8ca6d633b8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f899d4c849f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fa0badff223e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5f8aabc0c749e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f8be139b21f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5f8edaf75d5eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393020/normal_5fa53e3352651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fad544bec2cf.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/70f504d3-8444-4617-8c31-0a91006239ca/juzopegisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69deae59-6738-47d1-8318-7f6d47c8c86a/jemanedelikiwasedek.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_off0000b931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB931 4908 bytes
SHA-256: b389769c1564916aa8e131ebb1c47556ff831e433ff9d6dd6bfef905eb99a5ab
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 10860 bytes
SHA-256: 485422fa28fae8efb6a3907b736b4a8b83939877189e9dc5d1a71b96ff1a7c16

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