Malicious PDF — malware analysis report

Static analysis result for SHA-256 688bbf787dfced51…

MALICIOUS

PDF

39.6 KB Created: 2020-03-25 02:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6a46ec2b56f7416978d4e11f654dcde SHA-1: 071e9c89e5148770ba83f961424c969b96e2f6a3 SHA-256: 688bbf787dfced51901f91c984d4132755b90574b08c9bb187ecb89d71eb8336
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of embedded external links, identified by the 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, suggesting a tactic to manipulate search engine results or distribute potentially malicious content. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine a more specific purpose beyond link 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://grillou.fr/uploads/1/3/0/5/130547069/130547069.html#tough+mudder+training+course
    • http://soullinks.org/uploads/1/3/0/5/130590026/penag.pdf
    • http://missturquoisecircuit.com/uploads/1/3/0/3/130323186/zajapun.pdf
    • http://pipehugger.com/uploads/1/3/0/8/130874115/150403.pdf
    • http://adbouwcom.com/uploads/1/3/0/7/130775830/53ff90b92e9.pdf
    • http://sokyokushin.org/uploads/1/3/0/5/130546606/namelutix.pdf
    • http://francescaservalliwriter.com/uploads/1/3/0/5/130550824/kuwavuvenus-dibazaxabu.pdf
    • http://retrotradingco.com/uploads/1/3/0/5/130590180/75b96b4e.pdf
    • http://boekrecensiesblog.com/uploads/1/3/0/7/130775033/796231.pdf
    • http://k9ssolutions.com/uploads/1/3/0/2/130291766/lovugob.pdf
    • http://sufistudies.org/uploads/1/3/0/7/130775652/ab65439f2d.pdf
    • http://tastysoutherndelightllc.com/uploads/1/3/1/0/131070469/pajururi_pakon_benomifos.pdf
    • http://marksauter.com/uploads/1/3/0/2/130273978/sufigawix_zititewosewu_derudasulip.pdf
    • http://valsellsfresnohomes.com/uploads/1/3/0/7/130776603/3d52acd76f702.pdf
    • http://jhjensen.net/uploads/1/3/0/4/130436085/fc8248c9f24.pdf
    • http://rspmadison.org/uploads/1/3/0/3/130313346/rixefamatusilaxagagi.pdf
    • http://musicstockphoto.com/uploads/1/3/0/6/130604250/gasufu.pdf
    • http://britania.com.co/uploads/1/3/0/2/130288552/e8ffc3.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_off00007105.bin
a9300f6ce6259093597d4941727adb75ed86a8d3e306aff70dd3a0bbfe3878d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7105 7832 bytes

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