Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fbafe777958aa1…

MALICIOUS

PDF

44.2 KB Created: 2020-03-10 03:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1abddf020082f642b2c3c88bc236a63f SHA-1: 44d4d10408460fac49e7275470e3bea87e010dd8 SHA-256: b8fbafe777958aa1259cbff6b96b5e7f042031e86b67f67df6b6d3c15441907b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, suggesting a link farm or SEO spam tactic. The document body, though partially corrupted, contains references to 'Arduino mega 2560 digital pin voltage' and 'wkhtmltopdf', indicating a lure to potentially malicious websites. 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://www.secure-pof.com/uploads/1/3/0/3/130379757/130379757.html#arduino+mega+2560+digital+pin+voltage
    • http://baconsmilesministry.com/uploads/1/3/0/6/130604892/febexirase.pdf
    • http://moorestownwoodworks.com/uploads/1/3/0/6/130604934/jokuvatikurafuribaf.pdf
    • http://thehuroncollective.com/uploads/1/3/0/4/130489367/vurigapekidixud.pdf
    • http://kenzimmermanmusic.com/uploads/1/3/0/7/130776573/5198513.pdf
    • http://nicholasjozaites.com/uploads/1/3/0/3/130379138/mukovosaki-wivat-goloxakaligemuv-sagitewoz.pdf
    • http://thelexicographer.com/uploads/1/3/0/7/130775023/motut.pdf
    • http://paleodlites.com/uploads/1/3/0/4/130483142/8743911.pdf
    • http://mixadep.space/uploads/1/3/0/5/130588573/be6d5d8.pdf
    • http://office365online.live/uploads/1/3/0/7/130775672/mibokaxomigadidowid.pdf
    • http://anytimeanywheredoc.com/uploads/1/3/0/6/130621035/4166034.pdf
    • http://buildspan.uk/uploads/1/3/0/6/130639133/palusometusu.pdf
    • http://annemariabello.com/uploads/1/3/0/2/130288926/fofolatabujaf_geleduw_kiwedixisasul_xafos.pdf
    • http://indieallied.com/uploads/1/3/0/8/130813417/2720160.pdf
    • http://www.bhlaco.com/uploads/1/3/0/2/130288341/bitezi.pdf
    • http://notarypublicincalifornia.com/uploads/1/3/0/5/130539338/559ca310a42c.pdf
    • http://mechapocalypse.org/uploads/1/3/0/4/130483940/kibiges-votenulabato.pdf
    • http://spcupress.org/uploads/1/3/0/9/130969003/rakep-vamageneg.pdf
    • http://madcarn.com/uploads/1/3/0/5/130590054/649896.pdf
    • http://blockinsight.com/uploads/1/3/0/5/130551051/acc8febd.pdf
    • http://1strealtygroupllc.net/uploads/1/3/0/7/130740055/mikuzozevexozato.pdf
    • http://catalystconsultingcompany.com/uploads/1/3/0/7/130739404/rileze.pdf
    • http://hele888shishime.br3h.com/uploads/1/3/0/2/130289385/tuxomuzenixu.pdf
    • http://sarahdavisondesigns.com/uploads/1/3/0/6/130620607/kadalananilolivadal.pdf
    • http://talkingpicturestore.com/uploads/1/3/0/6/130620801/8214807.pdf
    • http://bisforbravo.com/uploads/1/3/0/5/130551140/3dae5f.pdf
    • http://talkingpicturestore.com/uploads/
    • 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_off00008400.bin
48c63997267445baae07bc90f40faad1615e459f30036d5d6e020530230f08df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8400 7372 bytes

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