Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a1d80b26c7f859…

MALICIOUS

PDF

70.6 KB Created: 2021-03-01 22:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 26a1114ceaa76cd04ef71589184e792e SHA-1: 90433b4fb50d10174414167f8f369a948f05cbd7 SHA-256: d0a1d80b26c7f859c0b642b325390404a1da0dfb97397aeee07ca44a7a9fdfa9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/wix?keyword=geologic+time+scale+worksheet+answers+pdf PDF link annotation
    • http://onlinetyz.xyz/baby_names_book_20207vg9n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_5fd93c428c06b.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/ghKiehj/24549162441.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/ihaiejg/72589394312.pdfIn PDF document text
    • http://creditscorerepair.info/7439459933k8mvv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373797/normal_5fdd067bc6e3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/hhvihcQ/la_vie_en_rose_zaz_lyrics_espanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506170/normal_602c421fd333c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_601652d29bbc8.pdfIn PDF document text
    • http://milanbeachs.space/daniels_hall_uc9n2dt.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/ciWd2jj/pirenarow.pdfIn PDF document text
    • http://gobigs.space/39895653830q7hje.pdfIn PDF document text
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/pagata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449392/normal_602ab654352a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 5756 bytes
SHA-256: 2f03ebfad187c9ae1e99a6458e310bdd5b60e93236daedc53e5f5bc4f59d5f0f
font_01_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 9844 bytes
SHA-256: 727193e7632996842c365244987c22051cf77f7f31cc54016d0d32d00d2b1517

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