Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dbd34640c7b83c…

MALICIOUS

PDF

42.5 KB Created: 2020-03-27 06:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c7550e3a580b0208c4ca5aab159aa52e SHA-1: 782f25dde88d5d0210b348f595fd8cc7bae9785c SHA-256: 36dbd34640c7b83cc070701b2486a1566e44a0eb6d0fc61faebef5b798da5d07
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 numerically or generically named, suggesting a link farm for SEO poisoning or phishing. The document body, though heavily obfuscated, contains references to a 'geometry workbook' and includes numerous URLs pointing to various domains, likely intended to redirect users to malicious content. The ML classifier 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://mindforyou.org/uploads/1/3/0/7/130738537/130738537.html#geometry+workbook+for+dummies+answers+common+core
    • http://mysoundcollective.com/uploads/1/3/0/3/130323581/f355bf56e7.pdf
    • http://cairnsclassictours.com/uploads/1/3/0/4/130436172/mazugejudalizu.pdf
    • http://www.texasmostawesomelawyers.com/uploads/1/3/0/8/130814245/jowisadigewigob.pdf
    • http://mail.ofirservice.co.il/uploads/1/3/0/2/130291556/5174156.pdf
    • http://peoriatraditionalboosterclub.com/uploads/1/3/0/7/130740572/ginemasivamil.pdf
    • http://redtwoapps.co.uk/uploads/1/3/0/6/130640109/e353a8d4e929.pdf
    • http://fivetwomarketing.com/uploads/1/3/0/4/130488839/833ff572fd938.pdf
    • http://yockerz.com/uploads/1/3/0/2/130272240/zumovujomexoxiwix.pdf
    • http://gwinnettqualitypressurewashing.com/uploads/1/3/0/5/130589237/5473391.pdf
    • http://mklophotography.com/uploads/1/3/1/0/131070161/1979090.pdf
    • http://www.feistytails.com/uploads/1/3/0/2/130287229/5d1f28dd6fdc2.pdf
    • http://room-keys.com/uploads/1/3/0/2/130270958/pixon.pdf
    • http://muluc.net/uploads/1/3/0/6/130639551/f91f7fadd.pdf
    • http://brides-and-weddings.com/uploads/1/3/0/8/130874091/8606905.pdf
    • http://welovemolly.com/uploads/1/3/0/4/130435956/febe1b52d6c021.pdf
    • http://emotionsnmotionltd.org/uploads/1/3/1/1/131164211/movoxasagurade_besojedarirubiw.pdf
    • http://top1percenter.com/uploads/1/3/0/5/130540868/nubujosisoba.pdf
    • http://hostmaster.cathiunsworth.com/uploads/1/3/0/8/130873863/fogufoxonavi.pdf
    • http://kenandlila.com/uploads/1/3/0/7/130740464/9689b2f1.pdf
    • http://tradinghero.com.au/uploads/1/3/0/7/130738841/172844.pdf
    • http://maxrysztak.com/uploads/1/3/0/5/130540063/4642225.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007384.bin
1cd8d860dd9ec8569f2f70cfea104a776eb7dca8b7ca333e34c01b9e22088de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7384 7792 bytes
font_01_sfnt_off000091e0.bin
985cbd9ba5b629f1b749d04d852c0eecb5d8ad374186a1044a60da9476420dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E0 2788 bytes

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