Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c7f198b671bdb1…

MALICIOUS

PDF

90.7 KB Created: 2020-12-24 16:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ad416344d4ce08d71aa6de743a6ed99d SHA-1: cb89cc470d76082ab5a70a30133498910b72cc4c SHA-256: 23c7f198b671bdb145a31c60061776688f9d2282b859abedf7ba77d2b91e6760
254 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 redirector links and SEO link farming, pointing to a phishing or malware distribution scheme. The primary malicious URL identified is 'https://ggtraff.ru/123?utm_term=late+transition+metal+atoms', which is also flagged as a redirector. The presence of numerous PDF links, including one to 'https://s3.amazonaws.com/xabalaru/lusixiziruvakuzufudowe.pdf', suggests an attempt to obscure the final malicious destination or to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=late+transition+metal+atoms In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_5fc0915e31dd7.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/3744619.pdfIn PDF document text
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/sizuzagukerivan.pdfIn PDF document text
    • https://monuwapomobi.weebly.com/uploads/1/3/4/7/134730240/7050f7401.pdfIn PDF document text
    • https://bagukewedofitaf.weebly.com/uploads/1/3/4/5/134507185/761317c4762e9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xabalaru/lusixiziruvakuzufudowe.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/cocina_criolla_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/eosinophilic_esophagitis_guidelines_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0000449b-97f1-4ff9-a00f-823af7cf8684/book_review_on_pet_sematary_by_stephen_king.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/diagenesis_catagenesis_and_metagenesis_of_organic_matter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b064a72e-4837-43a2-b8d1-438291d708c4/befixanigi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 4772 bytes
SHA-256: 4d5f6fa3b628575f2cf9eec9903cbc1d454f0aa1f525f917a141f05f9947ecaf
font_01_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 12260 bytes
SHA-256: 59ac7321a2b7f58e37ce8db0e63c82f9d2ffa852aa95cdbbb52d6f2ff02584af
font_02_sfnt_off0001491c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491C 16148 bytes
SHA-256: 1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8

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