Malicious PDF — malware analysis report

Static analysis result for SHA-256 89db6644f06c1560…

MALICIOUS

PDF

36.0 KB Created: 2020-06-03 05:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 531519445411d62fe3dd5ba0c8dcf1c5 SHA-1: dcae13e745197ec9b07b6be8a17e20dd9a780970 SHA-256: 89db6644f06c1560af9e5c5de10e59dee6a411ceb28a9582dfa4f5f8874b67ce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, a technique often used in SEO spam or link farm attacks. The document body mentions "Catcher in the Rye sparknotes", suggesting a lure to attract users interested in academic resources. The primary heuristic identified a "PDF_SEO_LINK_FARM" with 27 links, indicating a coordinated effort to direct traffic to various domains. The extracted URLs are the main indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://zanproperties.com/uploads/1/3/0/5/130588498/130588498.html#catcher+in+the+rye+sparknotes PDF link annotation
    • http://ielylike.com/uploads/1/3/1/4/131409926/3900176.pdfIn PDF document text
    • http://librosomraammikhaelaivanhovgratis.com/uploads/1/3/1/4/131482819/nufatokulu.pdfIn PDF document text
    • http://odysseymapsandcalligraphy.com/uploads/1/3/0/7/130740184/1c39f3905da26c.pdfIn PDF document text
    • http://mindcraftcoach.com/uploads/1/3/0/2/130289573/telibe_bexedigifenaz_nefuvonu_daxavigepa.pdfIn PDF document text
    • http://baycentrehealthandwellness.com/uploads/1/3/0/7/130775203/26ae4.pdfIn PDF document text
    • http://jaredroach.com/uploads/1/3/0/6/130639082/9212937b77d8.pdfIn PDF document text
    • http://freedomsheds.net/uploads/1/3/0/5/130540583/tegejafo_gijijuwaluwazet.pdfIn PDF document text
    • http://hme-technology.com/uploads/1/3/0/6/130639948/8dd81d33565c5.pdfIn PDF document text
    • http://carlsoncounseling.net/uploads/1/3/0/5/130542717/vegozo_runez.pdfIn PDF document text
    • http://zanproperties.com/uploads/1/3/0/5/130588498/terms.htmlIn PDF document text
    • http://zanproperties.com/uploads/1/3/0/5/130588498/dmca.htmlIn PDF document text
    • http://zanproperties.com/uploads/1/3/0/5/130588498/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://woxowogazo.files.wordpress.com/2020/05/lepatibudow.pdfIn PDF document text
    • https://miwilajavem.files.wordpress.com/2020/06/linajumesodufi.pdfIn PDF document text
    • https://zeruzotel.files.wordpress.com/2020/05/vulinon.pdfIn PDF document text
    • https://wemuwitez.files.wordpress.com/2020/05/71167344137.pdfIn PDF document text
    • https://pegolupoduw.files.wordpress.com/2020/05/49206254454.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 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000621e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x621E 10000 bytes
SHA-256: 6f866b6cac7e5542301e77cdf0585c64d3c906a2016b412e08e258a56fb84ace

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