Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5efc7fbd74a3e1…

MALICIOUS

PDF

54.7 KB Created: 2020-03-17 17:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d593b97368d1f54992bf30835ecab954 SHA-1: 4a008fa299edf245016879619fd588f5b1ccd16d SHA-256: 3f5efc7fbd74a3e1dd4019f47cf6a3ac9078d0732768e7f0bef38a8bab8c6599
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external PDF links suggests an attempt to drive traffic or distribute further malicious content through these linked documents.

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://adventuresbyprice.com/uploads/1/3/0/8/130813553/130813553.html#cual+es+el+segundo+paso+de+aa
    • http://makeupmobtraining.com/uploads/1/3/0/8/130814534/jodak.pdf
    • http://www.solsaic.ca/uploads/1/3/0/4/130489102/1015557.pdf
    • http://ccharveyministries.org/uploads/1/3/0/7/130739493/734881.pdf
    • http://lachozaspa.com/uploads/1/3/0/3/130324037/23c242857286e.pdf
    • http://www.mightysweets.com/uploads/1/3/0/5/130590367/bojifexuzago-kotazomivu-gudoxu.pdf
    • http://mta-sts.mx.ichc.net/uploads/1/3/0/6/130604264/xajeta-kesumunukufule-rixup.pdf
    • http://lcdhh.org/uploads/1/3/0/7/130739129/9769310.pdf
    • http://suzyscupcakes.com/uploads/1/3/0/4/130476034/1783210.pdf
    • http://www.thesortexfortress.com/uploads/1/3/0/3/130379094/vagoru.pdf
    • http://lens.fi/uploads/1/3/0/6/130639792/35f6be.pdf
    • http://babygrunts.net/uploads/1/3/0/4/130489926/fozemejape-nufasulu-wudabuw.pdf
    • http://aligrovue.com/uploads/1/3/0/2/130270792/558c95b5bbfa30c.pdf
    • http://xmen-agency.com/uploads/1/3/0/8/130814601/49dd4.pdf
    • http://napable.com/uploads/1/3/0/3/130313436/kiturerupakoxitapazu.pdf
    • http://whiteknuckleengines.com/uploads/1/3/0/4/130483842/3cd92ca55e.pdf
    • http://transgendermakeover.com/uploads/1/3/0/7/130740187/fuzamisurinemawegaf.pdf
    • http://nativeamericanca.com/uploads/1/3/0/7/130775507/683acaf.pdf
    • http://nuclearoven.com/uploads/1/3/0/6/130604290/2383545.pdf
    • http://www.stylegracely.com/uploads/1/3/0/7/130776499/8013446.pdf
    • http://holypost.us/uploads/1/3/0/4/130477234/demezoje.pdf
    • http://thebigimportantfoodblog.com/uploads/1/3/0/2/130287472/aac8cd99.pdf
    • http://karlschwiesow.com/uploads/1/3/0/2/130287943/8181984.pdf
    • http://stphilipstheevangelist.org/uploads/1/3/0/7/130775049/xatuxoki_sewofudagowakip_gokel_vinojapizumiw.pdf
    • http://secure.davidwilkins.com.au/uploads/1/3/0/5/130551339/bafawawanagamefid.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000096e6.bin
db274db2bb6e99ec5480bb21f0778be7fe11c01fda977969b75d1cc27c0ada30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E6 8804 bytes
font_01_sfnt_off0000b89a.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB89A 16036 bytes

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