Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2a28463e807e63…

MALICIOUS

PDF

39.5 KB Created: 2020-04-03 01:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc4efdfcb1832025190af023c3d5b873 SHA-1: 12c483e0c7d17fb3a849a523a0310603e0568f0b SHA-256: 8a2a28463e807e639f31072346746dc0b47c6640fb10b34b5bc7500d922cca4f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files. The document body text mentions 'Acca f2 kaplan exam kit pdf', suggesting a lure to trick users into clicking these links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

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://rivertoriverparanormal.com/uploads/1/3/0/8/130814011/130814011.html#acca+f2+kaplan+exam+kit+pdf
    • http://porthuronstorage.com/uploads/1/3/0/2/130287866/tanekotalebi_zubuxovawovo.pdf
    • http://komputersplusplus.com/uploads/1/3/0/2/130289021/pojejobamaxibimoboja.pdf
    • http://cpr-trainingclasses.net/uploads/1/3/0/5/130542692/2139820.pdf
    • http://itisthesweetestinthemiddle.com/uploads/1/3/0/7/130739750/bopanow.pdf
    • http://covwaitsfield.com/uploads/1/3/0/4/130476317/bb8a6e165.pdf
    • http://a-guide-inlife.info/uploads/1/3/0/5/130590158/3051408.pdf
    • http://campaignartwork.com/uploads/1/3/0/7/130738620/5380936.pdf
    • http://budorange.com/uploads/1/3/0/7/130739529/864364.pdf
    • http://fundacionnovavivo.org/uploads/1/3/0/5/130551324/7fb6fc6.pdf
    • http://prodbyedmond.com/uploads/1/3/0/6/130621051/vetamikiwiterolo.pdf
    • http://ytmatiabeauty.com/uploads/1/3/0/6/130604610/xidepom.pdf
    • http://eefmvz.net/uploads/1/3/1/3/131398453/kiwodib.pdf
    • http://applesandbooks.com/uploads/1/3/0/3/130379074/b6552b87185fd6b.pdf
    • http://siteessentialspromotions.com/uploads/1/3/0/6/130640000/e943d64a.pdf
    • http://socialspirituality.net/uploads/1/3/0/5/130588658/7c913c99069cc9f.pdf
    • http://familire.net/uploads/1/3/1/3/131379014/xarudelifuzesub_pekajago_febusovabiwavid_tanewuj.pdf
    • http://superhgh.com/uploads/1/3/0/4/130488172/6852243.pdf
    • http://serviportspain.com/uploads/1/3/0/7/130775797/fajoxudewuxupug_sajokirozorudes.pdf
    • http://vibrantcarpetdyeing.com/uploads/1/3/1/4/131484603/diriparoxijon_zokafozogizop_baledeniponizop_tegumomes.pdf
    • http://thecrowelycompany.com/uploads/1/3/0/4/130489220/bejejed.pdf
    • http://harrisonburgcleaners.com/uploads/1/3/0/5/130589229/a8f608fe126e3.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_off00006fb0.bin
da8cddc2b43f3a78f7262b08fd627918daf4c12359154baf7c91581ee55836e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB0 7996 bytes