Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c812d233756c41…

MALICIOUS

PDF

78.0 KB Created: 2021-03-09 22:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c5737139714fce1b493c26313d15ab31 SHA-1: 8dde5b472b99b4e35b6f48dabeab48276ca54c02 SHA-256: e9c812d233756c414d8635540693e1c7784e768d65fd7bfc8f8dafbd337bc612
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=beholder+pumpkin+template PDF link annotation
    • http://xtina.online/what_kind_of_anesthesia_is_used_for_thyroid_surgery84gkt.pdfIn PDF document text
    • http://arbitestpark.xyz/27336092532vi4pk.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/gjaRuWT/lalidu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5fecf49846520.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/c5hdgi5/naija_singles_ready_for_marriage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404292/normal_5ffa6f5874f8c.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/15041043351.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/ehiihij/41809463774.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/jd6oltv/jigazaposub.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/cljdfFn/music_store_near_me_open_on_sunday.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/Zywjggh/subamenoviril.pdfIn PDF document text
    • http://phillipen.online/kudumikevevubibn49k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_e27cd26954364a509a218bc54ae0039d.pdf?index=trueIn PDF document text
    • http://zasuwunal.myartsonline.com/rain_bird_esp-6tm_wont_turn_on.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_9f2cfe444fac4bb2bdca191dbbd68777.pdf?index=trueIn PDF document text
    • http://jabejanaboz.atwebpages.com/42956945092.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_28fd115fc4ed45e19070335e1c021942.pdf?index=trueIn 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_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 5136 bytes
SHA-256: f42e654fa2e918626f5ab325ef5bd5d7775e61271a225fb2417bf5e77fd5b889
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 10924 bytes
SHA-256: 8801d27d87950febe5d032ff1c55a25f85f3a6ed586127443bc96bd608e64ae4

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