Malicious PDF — malware analysis report

Static analysis result for SHA-256 838a275e2ffdafa6…

MALICIOUS

PDF

46.2 KB Created: 2020-03-29 06:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3b866ee73066fc4a9d01cb94b0c86856 SHA-1: 9b41397055d4a840ea66f5148594f8b5f6c66785 SHA-256: 838a275e2ffdafa6c682ab7eaf114f43060e695bc77b90bb04f6f6b560f30087
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 pointing to other PDF files, indicating a link farm designed to distribute malicious content. The ML classifier strongly identified this PDF as malicious. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the intent to redirect users to potentially harmful content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://5pointauto.com/uploads/1/3/1/4/131438481/131438481.html#valor+do+corolla+xei+2017+tabela+fipe
    • http://icountry.club/uploads/1/3/0/3/130379604/1273442.pdf
    • http://ccevenice.com/uploads/1/3/0/4/130483454/tovepuvabisamadejinu.pdf
    • http://www.blackwatersaddleclub.com/uploads/1/3/0/3/130323733/5886921.pdf
    • http://plussizeweddingdressesnewhampshire.com/uploads/1/3/0/8/130874051/7923023.pdf
    • http://goldadv.it/uploads/1/3/1/0/131071035/vafakalixomam.pdf
    • http://unifiedgreenproducts.net/uploads/1/3/0/2/130288753/54275c.pdf
    • http://shilohreunion.com/uploads/1/3/0/6/130639360/2648873.pdf
    • http://michaelamacpherson.com/uploads/1/3/0/6/130605034/7218295.pdf
    • http://jamesagibson.com/uploads/1/3/0/6/130639703/9c6548bb3546.pdf
    • http://nevrapoint.com/uploads/1/3/0/8/130813381/8310deba.pdf
    • http://girlsliewhenboyscry.com/uploads/1/3/0/4/130483248/tiduribebefiw_fakodazazipog_jewokoz_woxutetonikaw.pdf
    • http://recroomftl.com/uploads/1/3/0/3/130313049/4a60962.pdf
    • http://natashiapandther.com/uploads/1/3/0/6/130605426/pifonufibu.pdf
    • http://gnesis.org/uploads/1/3/1/0/131070501/3d686.pdf
    • http://www.soulsnatcher.shop/uploads/1/3/0/7/130775780/8748358.pdf
    • http://kevinsplumbingandwaterheaterbusiness.com/uploads/1/3/0/2/130270743/pazowuwotaxesarotol.pdf
    • http://rubymacfashion.com/uploads/1/3/0/5/130551491/repesalifav-waruz-kajufuwevipeze-siwejebofixo.pdf
    • http://rapeculture.sucks/uploads/1/3/0/3/130313698/4230426.pdf
    • http://katharinelion.com/uploads/1/3/0/5/130588505/2540702.pdf
    • http://jhonblack.net/uploads/1/3/0/6/130622002/0f9f94d877.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072c7.bin
cdd21b039baba00c343c201312277951173cd01d60fcc5afe10b2cb32b1c5779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C7 10144 bytes
font_01_sfnt_off0000953c.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x953C 16204 bytes

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