Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c79ae322e0d3a2…

MALICIOUS

PDF

37.3 KB Created: 2020-03-23 10:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 71985c7c7a6804b04791d656bec3e83c SHA-1: 6c0ba0902ea99cb9f4ebe723294d7f5f90297e7f SHA-256: 08c79ae322e0d3a27332601e7024014883c749d81937802c5458eb3e0e593c16
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm and password lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://avabaycompany.com/uploads/1/3/0/5/130544131/130544131.html#hallelujah+guitar+chords+pdf
    • http://equuleusservices.com/uploads/1/3/0/6/130639701/dokafokugas.pdf
    • http://h2erelief.com/uploads/1/3/0/2/130270987/905641.pdf
    • http://msborderwalk.org/uploads/1/3/0/5/130550805/00a6886c4ef1c7.pdf
    • http://www.artandremedy.com/uploads/1/3/0/7/130776677/wexobotajitaka.pdf
    • http://pyrotrons.com/uploads/1/3/0/8/130815059/domokizemosimezam.pdf
    • http://lifteens.com/uploads/1/3/0/2/130274169/7242070.pdf
    • http://www.notices.kitchentablepoker.com/uploads/1/3/0/7/130775294/getugawodor_xasafapapekokaz_pemukokovine.pdf
    • http://pisymposium.com/uploads/1/3/0/2/130272524/08d69.pdf
    • http://nuheila-art.com/uploads/1/3/0/4/130488401/fomubamop-baxesivumobom-lazelegu.pdf
    • http://cataniainunclick.com/uploads/1/3/0/6/130604445/8478622.pdf
    • http://orumalayalamdiary.com/uploads/1/3/0/5/130589411/zibijizuvidel_zebifepitununi_dawimapitonik.pdf
    • http://www.rvayesatlabs.com/uploads/1/3/0/5/130550937/6ad423efb7ab574.pdf
    • http://strangebrau.com/uploads/1/3/0/5/130550961/komapemuxatexe.pdf
    • http://swctv.org/uploads/1/3/0/4/130476784/4961617.pdf
    • http://apexgranitesolutions.com/uploads/1/3/0/9/130969148/ac053e1b.pdf
    • http://wonderful-tw.net/uploads/1/3/0/4/130488362/wajalom-pukonibu-napebu.pdf
    • http://pelosophotography-yearbooks.com/uploads/1/3/0/2/130272415/5199846.pdf
    • http://mooderopah.co.uk/uploads/1/3/0/7/130775805/sukan_xakapalebero_saxabomopikez.pdf
    • http://marinaruss.net/uploads/1/3/0/7/130740249/niditujuwij-bijojeto-zapuk.pdf
    • http://www.lifestylelimousine.ca/uploads/1/3/0/6/130604327/8758479.pdf
    • http://mail.adeline.ch/uploads/1/3/0/6/130603698/bumanowu_pasutekobib.pdf
    • http://lunaspets.com/uploads/1/3/1/0/131070500/6180860.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_off00006a29.bin
ee4ce8b416d43b6d23dd8e3bad0f3b47342f2dbe181798f7bc4027984d25e942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A29 7520 bytes

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