Malicious PDF — malware analysis report

Static analysis result for SHA-256 013c30853db374b0…

MALICIOUS

PDF

44.2 KB Created: 2020-07-15 13:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 0acf3f72fe2043a37ef57587e9c29347 SHA-1: b80f64a8e3fbc4e5bc906e61cf8a4f424ecfec36 SHA-256: 013c30853db374b08b99fce3c5b286413a3728e591905aeba1e8050f9f422ec7
254 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a malicious URL, identified as a redirector for SEO link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a dropper. The document body, though heavily obfuscated, appears to be a lure for a PDF download, likely to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-9528032-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9528032-0
  • 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://ttraff.ru/wb?keyword=educating%20rita%20willy%20russell%20pdf%20download In PDF document text
    • http://files.mollyharrisonart.com/uploads/1/3/0/7/130776483/genupuxodive-rotasokemilix-wevaxajelozaxa-dezazeladusop.pdfIn PDF document text
    • http://files.spectrumerc.com/uploads/1/3/2/7/132710756/wibinek.pdfIn PDF document text
    • http://files.englishiskillingme.com/uploads/1/3/2/6/132695566/cccc21bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3664/7317/files/50353255651.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9027/2675/files/49169467889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/29881495279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4487/2090/files/favimawuvuziziw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0485/3406/files/lesafunivo.pdfIn PDF document text
    • https://noneboge.files.wordpress.com/2020/07/10611916122.pdfIn PDF document text
    • https://xonoreja.files.wordpress.com/2020/07/11592174282.pdfIn PDF document text
    • https://lonefib.files.wordpress.com/2020/07/74947749506.pdfIn PDF document text
    • https://mowugowewuv.files.wordpress.com/2020/06/41096105931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/jukaziruk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/webojitomuxeboxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/sedabewatowutuni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50878135704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/zedudiziduxadagaboxi.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 5

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C45 5356 bytes
SHA-256: c6469fe432fdd91dacff93c0d1963ed7ce88f941425fed59762ffad035962adc
font_01_sfnt_off00007e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9F 10092 bytes
SHA-256: 059d3a2c227a6e0d0106bdc1f7b35b22b0c5db2f9fea76e7bb13a36e98d079f7

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