Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5c4b8e90ee00f1…

MALICIOUS

PDF

67.9 KB Created: 2020-12-23 17:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 625740eb16cfbb607cea825576e0b31f SHA-1: e150813dc019a16309196e950b2404325c25a292 SHA-256: cd5c4b8e90ee00f1ac0cb8894f5fdca7435e72a989604e360af624bdb2fda196
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a link to a known malicious redirector, 'https://traffking.ru/aws?utm_term=audi+r8+wallpaper+for+android', which is presented as a lure for free content. The document body, though heavily obfuscated, contains text related to 'Audi r8 wallpaper for android', reinforcing the lure. The primary attack vector appears to be a phishing attempt or a drive-by download facilitated by the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://traffking.ru/aws?utm_term=audi+r8+wallpaper+for+android In PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/86b792866d28467.pdfIn PDF document text
    • https://zegaturivelegob.weebly.com/uploads/1/3/1/4/131437779/4497947.pdfIn PDF document text
    • https://cdn.sqhk.co/wadumebe/HtzBgca/dasoperekekub.pdfIn PDF document text
    • https://bozaxadoduzake.weebly.com/uploads/1/3/4/3/134306622/sazebepavigomifupujo.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/narid-wifekivafuzav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/telasebisu/coredy_e300_manual_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/direito_penal_cezar_roberto_bitencourt.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/minecraft_pe_fermented_spider_eye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac6458f-1467-463f-9575-d60eb791ab9b/76187256776.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB610 2888 bytes
SHA-256: 6f2a6df54add4989ddb944bf337afdbe14cfe9709f41fdb3d2996e2e7fab70a8
font_01_sfnt_off0000c054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 4936 bytes
SHA-256: 2c37befceaf44d1220a46040e1cb380a72af751970c4093778e11f832e395df6
font_02_sfnt_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 10356 bytes
SHA-256: 6843d338b898c1e4a440f60f0424a0d0ab7d660889f7d3eb3f832d687e6fb683
font_03_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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