Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bb12d36ab37549…

MALICIOUS

PDF

43.0 KB Created: 2020-04-11 08:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24f47678742ebb09165b2dbc007b1819 SHA-1: e6ebe0b08c8a7ee910db6cdc320b39fec40d9948 SHA-256: 57bb12d36ab3754934aa6328566f9c7ace86a87f24e6b1c036d096f900983084
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various domains, many of which appear to be SEO-optimized PDF files. This suggests a link farm or a phishing campaign designed to drive traffic to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://benkregel.com/uploads/1/3/1/6/131637248/131637248.html#_____+measures+the+brightness+of+a+color+and+ranges+from+0%25+%28black%29+up+to+100%25+%28white%29
    • http://freedomcoffees.com/uploads/1/3/0/9/130969431/dujisowowu_rasakaxobaguno_mavadifig.pdf
    • http://fillmorebulldogbands.com/uploads/1/3/0/2/130288552/2366436.pdf
    • http://rayaneid.com/uploads/1/3/0/5/130589251/vevex.pdf
    • http://nmwordprocessing.com/uploads/1/3/0/9/130969845/vugupire.pdf
    • http://hydrosproutfarms.com/uploads/1/3/0/7/130740497/ziles_tipevujoxilesid.pdf
    • http://myresumego.com/uploads/1/3/0/9/130969809/rimot.pdf
    • http://renewnow.me/uploads/1/3/0/8/130873941/4e42645.pdf
    • http://tukteacompany.com/uploads/1/3/0/6/130639201/14da5f086389.pdf
    • http://backroadsandbarbedwire.com/uploads/1/3/1/4/131406558/wikuzozig-lujuxeluxadop-zedabo-refuzekufad.pdf
    • http://independantpattesting.com/uploads/1/3/0/4/130483770/4034241.pdf
    • http://audubonparkchurch.org/uploads/1/3/0/5/130539097/f8617c71.pdf
    • http://yogilea.com/uploads/1/3/0/5/130550800/nofonikeluwekodijake.pdf
    • http://deckbuilderswinnipeg.com/uploads/1/3/1/3/131379639/pawifilo.pdf
    • http://myresumego.com/uploads/1/3/0/9/130
    • 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_off00007145.bin
e823878dd338ec6a28fad2569cfd9523f6400f7f5f0ae7e01c987f77a50283f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7145 8816 bytes
font_01_sfnt_off000092c4.bin
63f5e27ee3d24cc00d413e59c301cc73ab377383609796993547673f2bea898c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C4 2600 bytes

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