Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d823e13123a886…

MALICIOUS

PDF

41.0 KB Created: 2020-04-07 21:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2bb2d4d41387ae65165aafd9e83cc716 SHA-1: b0f887582ae9465a80b8574b125a5163c146907d SHA-256: 62d823e13123a8865f81dd063bd3bf8689e73aa810f249ce2ddcea654146d1ee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to redirect users to a network of linked content, potentially for SEO spam or to distribute further malicious payloads.

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://melisainc.com/uploads/1/3/0/3/130313177/130313177.html#exploring+geology+4th+edition+pdf
    • http://dylanchun.com/uploads/1/3/1/4/131406275/1138474.pdf
    • http://sparxx.org.uk/uploads/1/3/0/8/130814749/kapejunuzilaxoresa.pdf
    • http://chunslandscape.net/uploads/1/3/0/3/130323453/sarareti-wefusisikukawuf-xinazapaxalo-jupetu.pdf
    • http://cambderma.co.uk/uploads/1/3/0/5/130589171/digazoni.pdf
    • http://nolangriswolddesign.com/uploads/1/3/0/7/130739062/lixotovedurusesevan.pdf
    • http://en.aegee-leiden.nl/uploads/1/3/0/5/130589293/7377409.pdf
    • http://washawaycancer.org/uploads/1/3/1/4/131407106/71cab1929.pdf
    • http://smashtherapy.net/uploads/1/3/0/5/130551182/vigupibe-gesaxa.pdf
    • http://sweetpennycreations.com/uploads/1/3/0/7/130775516/9525755.pdf
    • http://plumbcom.com/uploads/1/3/0/5/130539129/c475028f.pdf
    • http://personaltravelassistantvn.com/uploads/1/3/0/8/130874497/wadubonajupowi.pdf
    • http://bitcoinhamster.com/uploads/1/3/0/6/130620791/3547800.pdf
    • http://voordenwij.nl/uploads/1/3/0/6/130604414/bokagivu.pdf
    • 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_off00007992.bin
0538141889533ad9563e47d8b6eae7b707dd38611b3724d50514f8bd92d37659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7992 7476 bytes

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