Malicious PDF — malware analysis report

Static analysis result for SHA-256 82937d94f69dcf2a…

MALICIOUS

PDF

39.4 KB Created: 2020-03-11 12:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2f6bc28da691399302d76b9476c9455 SHA-1: d1af82ea19765a880e65b54f133bd5186eb878a8 SHA-256: 82937d94f69dcf2ab7444a6751420b8ae29f1dbcc7cf98d66a0852c7bef02231
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named PDF files, suggesting a link farm or SEO poisoning tactic. The document body text, though corrupted, contains references to "Airtel online recharge top up plans" and embedded URLs, indicating a phishing or scam lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links points towards an attempt to redirect users to potentially harmful content.

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://naturaltolife.com/uploads/1/3/0/5/130541445/130541445.html#airtel+online+recharge+top+up+plans
    • http://drcathyb.com/uploads/1/3/0/2/130271001/9029725.pdf
    • http://www.runrideyoga.com/uploads/1/3/0/8/130815059/3093857.pdf
    • http://mta-sts.mx.v23next.com/uploads/1/3/0/2/130274256/kiwajagogujoruf.pdf
    • http://oneanddonemobilespraytan.com/uploads/1/3/0/6/130621850/cbc13acf3e5.pdf
    • http://nyanyakrasnoyarsk.ru/uploads/1/3/0/4/130483204/wekagasod.pdf
    • http://aoshri.org/uploads/1/3/0/3/130324164/bc6660337917.pdf
    • http://bearfruitsbaskets.com/uploads/1/3/0/4/130476896/9850664.pdf
    • http://www.johngrahamtrust.org.uk/uploads/1/3/0/5/130551267/684312.pdf
    • http://cccaabbrefs.com/uploads/1/3/0/4/130436282/zoxozifuw.pdf
    • http://thespiritofaloha.net/uploads/1/3/0/7/130776385/4664578.pdf
    • http://rivercitymoto.com/uploads/1/3/0/4/130478935/74a2a.pdf
    • http://tenzome.com/uploads/1/3/0/5/130551004/gopodewupovukud.pdf
    • http://chronicwellnessexpert.com/uploads/1/3/0/7/130739885/dukawurenupole-tepexulivaso.pdf
    • http://cbservice.com.au/uploads/1/3/0/8/130814293/zelixanivanibekarami.pdf
    • http://garagedoorrepairparramatta.com.au/uploads/1/3/0/4/130488105/rujolemad_dijugupogorut_vofenifamisaxog.pdf
    • http://portsmouthboilerrepair.com/uploads/1/3/0/9/130969976/7376272.pdf
    • http://generationwhit.com/uploads/1/3/0/7/130776316/zumisigefo.pdf
    • http://mystreetstamp.com/uploads/1/3/0/3/130379635/188b9ffa.pdf
    • http://jmdmodern.com/uploads/1/3/0/2/130289322/julutejutunava.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_off0000708d.bin
11bbcc72f4c96b9c9f12ed949d9cc9981e5208b12d578d24ff21ffd2de92727a
pdf-font-stream PDF embedded font (sfnt) at offset 0x708D 7700 bytes