Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b221d4fa4c93363…

MALICIOUS

PDF

40.4 KB Created: 2020-03-25 04:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: a18541ad1e2f0608785ebe116f2fd5a8 SHA-1: 24d66939afd80422d1ac0c52a83c0b18dbb6079b SHA-256: 8b221d4fa4c933631adab60486c12de0a34c59206e606f93b0828051a3fba194
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body contains what appears to be search terms, further supporting the SEO lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://hitekmaster.net/uploads/1/3/0/6/130640181/130640181.html#stihl+fs+55+rc+parts+list PDF link annotation
    • http://labodylipo.com/uploads/1/3/0/6/130604030/pazowex.pdfIn PDF document text
    • http://www.tipsyglass.com/uploads/1/3/0/8/130813364/1795606.pdfIn PDF document text
    • http://lauracampbelldesign.com/uploads/1/3/0/6/130604393/tilomuvuj.pdfIn PDF document text
    • http://www.romanb3.com/uploads/1/3/0/2/130289515/pewopakinesere.pdfIn PDF document text
    • http://mullgetsresults.com/uploads/1/3/0/5/130546486/gugufodaxinan.pdfIn PDF document text
    • http://whitneyblairnorris.com/uploads/1/3/0/6/130604720/1630977.pdfIn PDF document text
    • http://www.thrivegrouplcsw.com/uploads/1/3/0/2/130272266/163d11282.pdfIn PDF document text
    • http://reachbmctraining.com/uploads/1/3/0/6/130620427/zajonekapas.pdfIn PDF document text
    • http://www.pyritequeen.com/uploads/1/3/0/6/130639593/5006931.pdfIn PDF document text
    • http://paozinhodeliciavirginia.com/uploads/1/3/0/4/130476970/c0e1710be32ae1.pdfIn PDF document text
    • http://360pro.be/uploads/1/3/0/2/130274322/dd73a2d5.pdfIn PDF document text
    • http://cavalierspublishing.com/uploads/1/3/0/7/130776886/9f685886976.pdfIn PDF document text
    • http://baanekspres1995.com/uploads/1/3/0/6/130603811/bovexa-bodefeni.pdfIn PDF document text
    • http://mammothlife.com/uploads/1/3/0/6/130640119/65c8a91c6.pdfIn PDF document text
    • http://www.feedtheworkout.com/uploads/1/3/0/6/130604233/tijagefivelowa-tojor-lixasaf-ginibigarijef.pdfIn PDF document text
    • http://www.thetravellingnannyblog.com/uploads/1/3/0/4/130435682/metukufote_fezapitubo.pdfIn PDF document text
    • http://www.schemeconsulting.com/uploads/1/3/0/6/130604902/fd739a2715183cc.pdfIn PDF document text
    • http://jeromemaplesphotography.com/uploads/1/3/1/0/131070998/fogexom_xebenikoxogurar_fojiwakedimuda.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

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_off000074f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F5 8088 bytes
SHA-256: aaff65b8699a9b5af772f15b47cf61bb17af82f9d87355a79303080e1ca75524

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