Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ff452cdde6bca8…

MALICIOUS

PDF

40.2 KB Created: 2020-04-11 09:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36f6f096d736c5e6eaae5bcb6306f623 SHA-1: bc4a5b341a86e85b5ae81b42556f4ccc71254928 SHA-256: 29ff452cdde6bca89c0c10e55d2a5b220e44a5ad45d5d6a2f4feb5c4835ca76a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document is identified as malicious by an ML classifier with high confidence. It contains a lure related to 'Hedge fund interview questions' and exhibits a link farm behavior, embedding numerous external URLs. These URLs likely serve to distribute additional malicious content or manipulate search engine results. No scripts were extracted from this sample.

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://74-123-72-249.mgwnet.com/uploads/1/3/1/6/131637723/131637723.html#hedge+fund+interview+questions
    • http://thelangsisters.com/uploads/1/3/0/7/130738506/5208476.pdf
    • http://silvermediapartners.com/uploads/1/3/1/3/131398008/cfdbbd46fb2.pdf
    • http://aquariumsalesandservice.com/uploads/1/3/0/7/130776575/7243883.pdf
    • http://antiques814.com/uploads/1/3/1/4/131405956/477075.pdf
    • http://boisdarcreations.com/uploads/1/3/0/3/130323160/jupomurizebogi-zefopipazibiwu.pdf
    • http://organizingwithanna.com/uploads/1/3/0/6/130639240/suzutobo_deviwarukud_lunuwem_madufefovovax.pdf
    • http://pastimepooltables.com/uploads/1/3/0/4/130488228/jasilepunu_tatulig_monutomesagon_jomuvit.pdf
    • http://wefreelancefotografie.com/uploads/1/3/0/4/130435697/topuxixe-junezaniz.pdf
    • http://wendymcclain.com/uploads/1/3/0/2/130291689/koxoduro-turefozero-sakujixavolomu.pdf
    • http://hidesertfireprotection.com/uploads/1/3/0/7/130776041/db308d4083590.pdf
    • http://codemanllc.net/uploads/1/3/0/5/130550859/luxusidi.pdf
    • http://underwoodsfundingsolutions.com/uploads/1/3/0/7/130776787/981558dde.pdf
    • http://andreacolecoaching.com/uploads/1/3/0/5/130541351/7189360.pdf
    • http://lesimprimespersonnalises.com/uploads/1/3/0/2/130291352/e7a84.pdf
    • http://admgems.com/uploads/1/3/0/6/130603866/jozujugosolumo.pdf
    • http://silvermediapartners.com/uploads/1/3/1/3/131398008/cfdbbd4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007301.bin
cdd733b5a287abc2a2a7d4a1560fc94e50b408cc90b2198112a6f0d0d0f78333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7301 8340 bytes

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