Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda4221cfea4f5b4…

MALICIOUS

PDF

41.3 KB Created: 2020-06-05 16:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: debd2b4ad87590eb9e1175d6c3425330 SHA-1: 8d0c1e74f809f3c5396295b0858673c249931877 SHA-256: bda4221cfea4f5b4800e01548b3f0eb640ba3764ff1023e0b7cc851b551fe1c9
94 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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The document body contains a sexually suggestive title ('Celine verbeeck naakt') which is likely a lure to attract clicks to the embedded URLs. The ML classifier also strongly indicated maliciousness.

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://smsjdetroit.org/uploads/1/3/0/5/130588185/130588185.html#celine+verbeeck+naakt
    • http://classyglow.com/uploads/1/3/1/3/131383854/8be1eb.pdf
    • http://wilson-insurance-inc.com/uploads/1/3/0/7/130740117/06cc4bdb19e.pdf
    • http://strategicmeetingtechpodcast.com/uploads/1/3/0/2/130289625/0d515c3f0.pdf
    • http://60andme.com/uploads/1/3/1/3/131380404/342133.pdf
    • http://gentlegiantsrun.com/uploads/1/3/0/2/130289719/nagokogupijasob_nujokotirabisu.pdf
    • http://fulltimeman.com/uploads/1/3/0/5/130589007/tutabudapuwadefiwar.pdf
    • http://educationalroboticsreview.com/uploads/1/3/0/3/130313400/mesujuro.pdf
    • http://loumaerenae.com/uploads/1/3/0/4/130436202/07c3b04e94b6.pdf
    • http://jakeberman.net/uploads/1/3/1/4/131454219/gedaxon.pdf
    • http://indyblueentertainment.com/uploads/1/3/1/3/131379555/8500914.pdf
    • http://growfoodnotdebt.com/uploads/1/3/0/7/130740089/lukowozunirid-kumovokirilinux.pdf
    • http://jcresidentialcda.com/uploads/1/3/1/3/131379384/tebid.pdf
    • http://smsjdetroit.org/uploads/1/3/0/5/130588185/terms.html
    • http://smsjdetroit.org/uploads/1/3/0/5/130588185/dmca.html
    • http://smsjdetroit.org/uploads/1/3/0/5/130588185/policy.html
    • http://strategicmeetingtechpodcast.com/uploads/1/3/0/2/130289625/0d515c3f0.p
    • https://suwaboto.files.wordpress.com/2020/06/74112099600.pdf
    • https://sokatuvep109458814.files.wordpress.com/2020/06/xupogojejorowurukusuruj.pdf
    • https://movugabopiru.files.wordpress.com/2020/06/15651409959.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_off0000762b.bin
233b7df42587389325bf355252ad0802d2ba36e0d245eab2b58eb6b760be223a
pdf-font-stream PDF embedded font (sfnt) at offset 0x762B 10536 bytes