Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbff2bb2d487c8d1…

MALICIOUS

PDF

39.7 KB Created: 2020-03-22 04:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dae2022e3455c4b3efea04b1aacdce53 SHA-1: cdde0c26a1280121e8b90cf46b591aa289ef3b90 SHA-256: fbff2bb2d487c8d1074da836a9aca8ea45f07df658cc67be5517ac24fb1fcbcb
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spamming operation. The document body, though partially corrupted, contains a lure about elaborating a thesis, directing users to a specific URL. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a phishing or redirection attempt.

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://cozyoasis.com/uploads/1/3/0/5/130590371/130590371.html#como+elaborar+una+tesina+paso+a+paso
    • http://genevaantiquemarket.com/uploads/1/3/0/4/130489627/4c4d7af7c20419.pdf
    • http://ejunkie.mobi/uploads/1/3/0/7/130740027/kodigozufona_diteb_wepusur_lanolavadirum.pdf
    • http://lovellaweddings.net/uploads/1/3/0/5/130590312/malewa_fotixogasef_folisipajod.pdf
    • http://michaelvincentmagic.com/uploads/1/3/0/5/130590481/xafirivuduzaxoluneze.pdf
    • http://www.alessertraveledroad.com/uploads/1/3/0/5/130544746/7178902.pdf
    • http://hostmaster.ejlbrickwork.com/uploads/1/3/0/2/130287488/sepuzibi.pdf
    • http://digitalfreebies.net/uploads/1/3/0/4/130488123/8971120.pdf
    • http://heavenlypetsok.net/uploads/1/3/0/5/130540085/2973702.pdf
    • http://photosandburritos.com/uploads/1/3/0/7/130738596/lizin.pdf
    • http://hostmaster.oconnorsigns.com/uploads/1/3/0/6/130603847/waxoxudow.pdf
    • http://www.firstholidaytours.com/uploads/1/3/0/3/130323936/nomakemuliw_zurojawija_vunolugok.pdf
    • http://cctvsystemssheffield.com/uploads/1/3/0/3/130313356/xumemi.pdf
    • http://apollomdclinicalsupport.com/uploads/1/3/0/8/130814611/374758.pdf
    • http://hostmaster.catalyst.gg/uploads/1/3/0/4/130489175/c275d6f2c32.pdf
    • http://ncscja.org/uploads/1/3/0/3/130323552/3702074.pdf
    • http://prometheanconcepts.net/uploads/1/3/0/8/130874077/5114598.pdf
    • http://www.tamwaileongtwl.com/uploads/1/3/0/7/130776103/f25c9d695110f4.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_off000071bd.bin
286ca5dd1f3fe8a710d5ef6e01debadd6749e44758925ea9f82d599d4ea72d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BD 9204 bytes

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